Question

in how many years will a sum of Rs.600 yield an interest of Rs.90 at 10 percentage?​

Answer 1

Answer:

The simple interest on a sum of money will be Rs. 600 after 10 years. If the principal is trebled after 5 years, what will be the total interest at the end of the tenth year?

accrued simple interest for ten years is I10=600Rs.

I=Ptr%

600=10Pr%

Interest for 1 year is Pr%=60−−−(1)

If A=3PAfter 5 years

3P=P(1+5r%)

3=1+5r%

5r%=2

r%=40%

From (1) principal is P=6040%

P=150

3P=450

Total interest from fifth year to 10th year at the rate of 40% is

I=450×5×40%

I=900

Up to the fifth year total interest earned is 60×5=300

Total interest for 10 years is I10=300+900=1200