Question

A sum of Rs. 6ooo amounts to Rs. 7200 at a
certain rate of simple interest in 4 years. If the rate of interest is increased by 1.5 times, then the same sum amounts in 5 years is?
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Answer 1

ANSWER...

Principal = 6000 Rs.

Amount = 7200 Rs.

Time = 4 years

Then

Interest = 7200 - 6000 = 1200 Rs

for 4 year 1200 Rupees is interest.

For one year interest is 1200 / 4 = 300 Rs.

therefore

Rate of interest for one year

R = (300 / 6000) × 100

R= 5%

Rate of interest is increased by 1.5 times

R = 1.5×5= 7.5%

Sum of Amounts in 5 year

Interest for one year

I = (7.5 / 100) × 6000

I = 450 Rs.

Then for 5 years = 5×450=2250 Rs

Total amount = 6000 + 2250 = 8250 Rs.