1What is interest?
2What is the principal?
3What is meant by the rate of interest?
4Write 30 months in years.
5Find the simple interest by the unitary method when the principal is Rs 500, the rate is 10% and the time is 3 years.
6Find the simple interest when the principal is Rs 3,300, the rate is 7.5% and the time is 3 years 6 months.
7Find the time when the principal is Rs 1,260, the rate is 5% and the interest is Rs 378.
8Find the rate of interest when the principal is Rs 6,000, the time is 3 years 6 months and the interest is Rs 1,155.
9Find the principal when the rate is \( 6\frac{2}{3}\% \), the time is 5 years and the interest is Rs 400.
10Ganga deposited Rs 3,500 in Nepal Bank Limited at 7% per year. How much interest does she receive after 4 years?
11Sandesh borrowed Rs 18,000 from a bank at 6.6% per year. How much interest must he pay the bank after 30 months?
12Bhargav received Rs 550 of interest from Rastriya Banijya Bank after 4 years at a rate of 5.5% per year. How much money had he deposited?
13Sarisma kept Rs 7,600 in a bank and the bank gave her Rs 1,254 of interest after 3 years. What was the rate of interest?
14For how many years must Rs 900 be deposited at 12% per year to earn interest equal to the interest that Rs 1,080 earns in 4 years at 10% per year?
15Find the amount when the principal is Rs 5,24,000, the time is 3 months and the rate is 11%.
16Karuna borrowed Rs 2,00,000 from a bank at 12% per year for cattle farming. If she paid the principal and the interest together after 30 months, how much did she pay in all?
17How much money must be deposited at 10% per year to receive Rs 610 of interest in 4 months?
18Aadira saves Rs 40,000 in a bank at 5% per year and must pay income tax of 5% on the interest. How much money does she receive in all after 4 years?
19Hari borrowed Rs 3,00,000 from a commercial bank at 12% per year for 2 years 6 months to go to Malaysia for work. (a) Find the simple interest. (b) Find the single sum he must pay to clear the loan.
20Rs 1,500 earns Rs 180 of interest in 2 years. Find the rate of interest by the unitary method.
21Find the amount on Rs 2,000 at 8% per year for 5 years in two different ways, and check that the answers agree.
22A student found the interest on Rs 6,000 at 5% per year for 8 months by writing \( I = \frac{6000 \times 8 \times 5}{100} = 2400 \). Where is the mistake, and what is the correct answer?