Question

a sum of money given at compound interest doubles itself in 4 years. in how many years will the amount be eight times?​

Answer 1

Suppose 100 be the principal.

In 4 years it doubles and becomes 200.

In next 4 years 200 double to 400.

In next 4 years 400 doubles to 800.

Hence the period for 8 times is 12 years.

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Answer 2

Answer:

the answer of your question is 12 years

Step-by-step explanation:

Let amount deposited= x

after four years amount = 2x

After eight years amount = 4x

After 12 years amount = 8x

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