Secondary School (English Medium) (5 to 8) कक्षा ७ - CBSE Question Bank Solutions

The ______ of interest on a sum of ₹ 2000 at the rate of 6% per annum for `1 1/2` years and 2 years is ₹ 420.

The interest on ₹ 350 at 5% per annum for 73 days is ₹ 35.

The simple interest on a sum of ₹ P for T years at R% per annum is given by the formula: Simple Interest = `(T xx P xx R)/100`.

Interest on ₹ 1200 for `1 1/2` years at the rate of 15% per annum is ₹ 180.

Amount received after depositing ₹ 800 for a period of 3 years at the rate of 12% per annum is ₹ 896.

₹ 6400 were lent to Feroz and Rashmi at 15% per annum for `3 1/2` and 5 years respectively. The difference in the interest paid by them is ₹ 150.

Chalk contains 10% calcium, 3% carbon and 12% oxygen. Find the amount of carbon and calcium (in grams) in `2 1/2` kg of chalk.

Radhika borrowed ₹ 12000 from her friends. Out of which ₹ 4000 were borrowed at 18% and the remaining at 15% rate of interest per annum. What is the total interest after 3 years?

Dhruvika invested money for a period from May 2006 to April 2008 at rate of 12% per annum. If interest received by her is ₹ 1620, find the money invested.

Bhavya earns ₹ 50,000 per month and spends 80% of it. Due to pay revision, her monthly income increases by 20% but due to price rise, she has to spend 20% more. Find her new savings.

A memorial trust donates ₹ 5,00,000 to a school, the interest on which is to be used for awarding 3 scholarships to students obtaining first three positions in the school examination every year. If the donation earns an interest of 12 per cent per annum and the values of the second and third scholarships are ₹ 20,000 and ₹ 15,000 respectively, find out the value of the first scholarship.

What sum of money lent out at 16 per cent per annum simple interest would produce ₹ 9600 as interest in 2 years?

Divide ₹ 10000 in two parts so that the simple interest on the first part for 4 years at 12 per cent per annum may be equal to the simple interest on the second part for 4.5 years at 16 per cent per annum.

₹ 9000 becomes ₹ 18000 at simple interest in 8 years. Find the rate per cent per annum.

In how many years will the simple interest on a certain sum be 4.05 times the principal at 13.5 per cent per annum?

The simple interest on a certain sum for 8 years at 12 per cent per annum is ₹ 3120 more than the simple interest on the same sum for 5 years at 14 per cent per annum. Find the sum.

The simple interest on a certain sum for 2.5 years at 12 per cent per annum is ₹ 300 less than the simple interest on the same sum for 4.5 years at 8 per cent per annum. Find the sum.

Determine the integer whose product with (–1) is 37.

Determine the integer whose product with (–1) is 0.

[(–8) × (–3)] × (–4) is not equal to ______.