Question

A sum of money amounts to rupees 52,080 in 2years and rupees 77,280 in 7 years,at simple interest. Find the sum and rate percentage of interest

Answer 1

p(1+2r/100)=52080
pr= 50(52080-p)
p(1+7r/100)=77280
pr=100(77280-p) /7
50(52080-p)=100(77280-p)/7
when u will solve it,u will get p=42000.
42000(1+2r/100)=52080
r=12 percent.