Question

If the total interest of a principal in 6 years be 30% of the principal,then the total interest will be equal to the principal in?
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Answer 1

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Let the principal = Rs.x of R %

Then S.I = 30% of Rs x =30 / 100 × x

Let the time in which the principal is equal to simple interest be t years

Then

Rate = (100×3x /10 × x ×6) %

= 5 %

Now,

Sum = Rs.x

SI = Rs x

Rate = 5%

Thus time = ( 10 × r / x × 5 )years

= 20 years

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Answer 2

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➠Let the principal = ₹x of r

➠Then S.I = 30% of Rs x =30 / 100 × x

Hence,the time in which the principal is equal to simple interest be t years

Then,

➠ Rate = (100×3x /10 × x ×6) % = 5 %

Now,

➠Sum = Rs.x

➠SI = Rs x

➠Rate = 5%

➠Thus time = ( 10 × r / x × 5 )years

= 20 years

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