IDPX

Question 1

Drapery length calculation?

Answer 1

Finished height
- header
- hem
= preliminary length

Preliminary length ÷ pattern repeat
→ round UP
× repeat
= cut length per panel

Question 2

Typical drapery fullness factors?

Answer 2

100% = 2× width
150% = 2.5×
200% = 3×

Question 3

Drapery calculation formula?

Answer 3

Window width (amount of ft*12)

+ stacking (fabric width ÷ 3)

+ returns/overlap (assume 12” for R+O)

× fullness factor

Question 4

What is the correct NCIDQ method to calculate broadloom carpet?

Answer 4

Determine seam direction (parallel to longest dimension)

Add all cut LENGTHS of carpet required
= total linear feet

Convert to linear yards
feet ÷ 3

x total yards by roll width (converted to yds)

Round UP
= square yards required

Question 5

What is the correct stair carpet calculation method?

Answer 5

Measure tread depth.

Measure riser height.

Add tread + riser = one stair unit.

Multiply by number of steps.

Add landing length (if present).
= total run length

Total run length ÷ roll width
= number of widths

(No extra tread unless question states)

Question 6

20 ft wide room, 12 ft roll — how many widths?

Answer 6

20 ÷ 12 = 1.67 → round to 2 widths

Question 7

Broadloom carpet calculation formula?

Answer 7

Number of widths needed = Room width ÷ roll width (round UP)
Cut length = room length + waste
Total carpet = widths × cut length

Question 8

How do you adjust calculations for wallpaper pattern repeat?

Answer 8

Wall height
÷ pattern repeat
→ round UP
× repeat
= adjusted strip length

(then use adjusted strip length to find strips per roll)

Question 9

When do you NOT subtract openings in wallpaper finish calculations?

Answer 9

Small openings or specified by material type (ex: vinyl under 54”)

Question 10

Drapery stack-back formula?

Answer 10

space for stack-back = Fabric width ÷ 3

Question 11

Typical amount to account for both overlap and return on a set of drapery panels?

Answer 11

12”

Question 12

Typical center drapery overlap?

Answer 12

6”

Question 13

Typical drapery return depths?

Answer 13

3-3.5” EACH SIDE

Question 14

How do you calculate VINYL wallcovering (linear length method)?

Answer 14

STEP 1 — Find wall area
Perimeter × height

STEP 2 — Subtract openings
Subtract doors only
Do NOT subtract windows under 54” width

STEP 3 — Divide by material width
Wall area ÷ roll width (in feet)
= linear feet required

STEP 4 — Convert to linear yards
Linear feet ÷ 3

⚠ No pattern repeat adjustment unless stated

Question 15

What are the advantages and disadvantages of a general partnership?

Answer 15

Advantages:
* Shared management and decision-making
* Shared financial resources
* Pass-through taxation

Disadvantages:
* Unlimited personal liability for all partners
* Each partner liable for actions of the other
* Potential for internal disputes

Question 16

How do you calculate wallpaper using the strip method?

Answer 16

STEP 1 — Find wall area
Perimeter × wall height

STEP 2 — Subtract openings
Subtract 15 sq ft per door
(Do NOT subtract small windows unless stated)

STEP 3 — Adjust strip length for pattern repeat
Wall height ÷ repeat
→ round UP
× repeat = adjusted strip length

STEP 4 — Find strips per roll
Roll length ÷ adjusted strip length

STEP 5 — Find number of strips needed
Wall perimeter ÷ roll width = strips needed

STEP 6 — Find rolls
Total strips ÷ strips per roll
→ round UP

⚠ Do NOT add waste unless question says

Question 17

What are the advantages and disadvantages of a corporation?

Answer 17

Advantages:
* Limited liability for shareholders
* Easier to raise capital
* Business continuity beyond owners

Disadvantages:
* Double taxation (corporate + dividends)
* More complex setup and regulation
* Formal reporting requirements

Question 18

What are the advantages and disadvantages of a sole proprietorship?

Answer 18

Advantages:
* Simple and inexpensive to establish
* Full control by owner
* Minimal regulatory requirements

Disadvantages:
* Unlimited personal liability
* Difficult to raise capital
* Business ends if owner leaves or dies

Question 19

What are the advantages and disadvantages of an S-corporation?

Answer 19

Advantages:
* Limited liability
* Pass-through taxation (no double tax)
* Professional credibility

Disadvantages:
* Ownership restrictions (limited shareholders)
* More administrative requirements than partnership
* Must meet IRS eligibility rules

Question 20

What are the advantages and disadvantages of an LLC?

Answer 20

Limited liability for members
* Flexible taxation (can choose tax structure)
* Fewer formalities than corporation

Disadvantages:
* State regulations vary
* May have limited life in some states
* Can be harder to raise capital than corporation

Question 21

What are the advantages and disadvantages of a limited partnership?

Answer 21

Advantages:
* Limited partners have limited liability
* Useful for raising capital from investors

Disadvantages:
* At least one general partner has unlimited liability
* Limited partners have little management control

Question 22

What is the key difference between a sole proprietorship and an LLC?

Answer 22

Sole Proprietor = No legal separation → Personal assets at risk

LLC = Legal separation → Personal assets protected

Question 23

What is the key difference between a general partnership and a limited partnership?

Answer 23

General partners manage and are fully liable; limited partners have limited liability but limited control.

Question 24

How is a billing rate calculated in an interior design firm?

Answer 24

Step 1: Determine direct labor cost (employee salary or hourly wage).
Step 2: Add fringe benefits (taxes, insurance, etc.).
Step 3: Determine overhead (rent, utilities, admin, etc.).
Step 4: Apply a multiplier to cover overhead + profit.

Billing Rate = Direct Labor × Multiplier

Typical multiplier range: 2.7 – 3.0