Question

How many years will take certain amount to double at 8% interest per annum at simple interest?

Answer 1

Answer:

The time taken to double the certain amount at 8% rate is 12.5 Years.

Step-by-step explanation:

Hey Mate,

Given :

Rate = 8%. @ S.I

Suppose,

P = X

A = P + S.I. ( Amount is double = 2X )

2X = X + S.I.

S.I = X

So,

S.I. = PRT/100

•X = ( X × 8 × T )/ 100

•T = (100 × X) / (X × 8)

•T = 12.5 Years

The time taken to double the certain amount at 8% rate is 12.5 Years.

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Answer 2

Answer:

12.5 years (or) 12 1/2 years

Step-by-step explanation:

P = X

Amount is double is 2x

A = P + S.I

2X = X + S.I

S.I = 2X - X = X

If the P is 100

100 × 100

T = ----------------

100 × 8

T = 25/ 2

T = 12 1/2