1
Q
Pop increase one year decrease the other year
Pop after n years is
A
P(100+x)(100-y)(100+z)/100100100*…..n
2
Q
Pass % is X
Secured Y marks
Failed by Z marks
Maximum marks
A
100(y+z)/x
3
Q
% increase
A
(a-b/b)*100
4
Q
% of R to Q
A
Q/R *100
5
Q
% of R is Q
A
R/Q *100
6
Q
A’s income is r% more/ less than B’s. How much decrease % is B’s income less/more than A’s income?
A
Less= (r/100+r)100
More= (r/100-r)100
7
Q
Expenditure
A
Price *consumption
8
Q
Total value
A
Average*no of element
9
Q
Work
A
Efficiency*time
10
Q
Cost
A
Rate*time
11
Q
Net change (2 successive change)
A
a+b+(ab/100)
12
Q
Diminished and increased
Net effect
A
Inc%-dec%-[(inc%dec%)/100]
