Question

(6) How long will it take for an amount to become 5 times of itself at 20% per annum simple interest?​

Answer 1

Answer:

Let the sum be Rs x .

So, Amount = Rs 5x .

Let after t years, the sum will become 5 times of itself .

Rate = 20 % p.a.

So, SI = Rs 5x- x = Rs 4x .

Required time = 100 × SI / P × R = (100×4x/ x× 20 )yr

= 5/4 years .

Step-by-step explanation:

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Answer 2

Answer:

Let the sum be ₹x.

Amount=₹5x

SI=₹(5x-x)

SI=₹4x

Rate of interest=20%

T=SI×100/P×R

T=4x×100/x×20

T=20yrs

Step-by-step explanation:

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