Question

At what percentage of rate per annum simple interest will a certain sum of money becomes double in 10 years?

Answer 1

Solution:-

》let p = 100rupees ,

》rate = r , time (n) = 10years

》si =( p×r×n)/100

》si = 100×r×10/100

》si = 10r

》A = p+si = 100+10r = 10(10+r)

acourding to quetion ,money becomes double in 10 yeara

we have,

》A= 2×100

》10(10+r) = 200

》10+r = 20

》(r =10%)ans