Question

plzzz solve it please its very urgent at 7:00 pm my test going to begin from chapter compound interest

Answer 1

Answer:

24 years

Step-by-step explanation:

Define x:

Let x be the principal amount invested.

It took 8 years to quadruple the sum

Interest = 4x - x = 3x

Find the interest earned in 1 year:

8 years = 3x

1 year = 3x ÷ 8 = 3/8 x

Find the number of years needed for the amount to become 10 times:

Interest = 10x - x = 9x

Number of years = 9x ÷ 3/8x = 24

Answer: It will take 24 years for the sum to become 10 times the sum.