Question

the interest on rs700 amount to 112 in 2 years at a certain rate of interest in what time will be the amount 2000 amount to the Alice 4200 at the same rate of interest

Answer 1

In first case
P=700
Si=112
T=2yr

SI =pxrxt/100

R=SI X 100/PXT

=112 x 100 / 700 x2

R=8%

Case-2
P=2000
A=4200
Si=4200-2000=2200
R=8%

T=2200x100/2000x8=110/8=55/4

13 years and 3/4 months

13 years 9 months