Question

a sum of money lent on simple interest becomes 8 upon5 of itself in 6 years find the rate of interest per annum ​

Answer 1

Answer:

10%

Step-by-step explanation:

let principal=x

so 8x/5-x=3x/5

3x/5=x×r×6/100

r=10%

Answer 2

Answer:

Step-by-step explanation:

Let x be the sum

therefore, amount= 8x/5

let rate of interest be r%

time = 6 years

S.I = (x * 6 * r)/100

= 6xr/100

By condition,

x + 6xr/100 = 8x/5

100x + 6xr/100=8x/5

5(100x + 6xr)= 800x

500x +30xr= 800x

30xr = 800x-500x

30xr= 300x

r = 300x/30x

r= 10%

The rate of interest is 10%