What sum (in ₹) will earn a simple interest of ₹1,320 in 4 years at 8% per year rate of interest?
4,125
Using \(SI=\dfrac{P\times R\times T}{100}\): \(1320 = \dfrac{P\times8\times4}{100}\).
\(1320 = \dfrac{32P}{100} \Rightarrow P = \dfrac{132000}{32} = 4125\).
Hence, the required sum is ₹4,125.
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Important Questions from Simple Interest
Anil lent a sum of Rs. 5,000 on simple interest for 10 years in such a way that the rate of interest is 6% per annum for the first 2 years, 8% per anmum for the next 2 years and 10% per annum beyond 4 years. How much interest (in Rs.) will he earn at the end of 10 years?
What will be the simple interest on a sum of Rs. 12000 at the rate of 15 percent per annum for three years ?
If in 13 years fixed sum doubles at simple interest, what will be the interest rate per year? (correct to two decimal places)
On simple interest a sum of Rs. 640 becomes Rs. 832 in 2 years. What will Rs. 860 become in 4 years at the same rate of simple interest?
A certain sum amounts to Rs. 81840 in 3 years and to Rs. 92400 in 5 years at x% p.a. under simple interest. If the rate of interest is becomes (x + 2)%, then in how many years will the same sum double itself?
