Question

If rs 900 amounts to rs 1080 in 4 years at simple interest, what sum will amount to rs 1275 in 5 years at the same rate

Answer 1

let principle =900
time. =4 years
rate of interest = r
simple interest = ptr/100
amount= 1080

according to the problem,

900×4×r/100=1080
r= 30%
next,
principle= p
time=5 years
rate of interest = 30% ( given same interest)
ptr/100=1275
p×5×30%/100=1275
3p/2=1275
3p=1275×2
3p=2250
p=2250/3
p=850