Question

If 1 rupee becomes 9 rupee with simple interest in 60 years then what will be the rate of interest per annum​

Answer 1

Answer:

here sum is Rs 1

interest is Rs (9-1) =Rs 8

time =60 years

let rate of interest per annum us x%

so,

8= 1.x.60/100

=> 8=3x/5

=> 3x=40

=> x=40/3

rate of interest per annum is 40/3 %=13 1/3 %