Simple Interest
MCQs Math


Question:     Calculate the amount due after 10 years if John borrowed a sum of $5200 at a rate of 10% simple interest.


Correct Answer  $10400

Solution And Explanation

Solution

Given,

Principal (P) = $5200

Rate of Simple Interest (SI) = 10%

Time (t) = 10 years

Thus, Amount (A) = ?

The Rate of Interest is always calculated per annum, i.e. per year.

Thus, here 10% simple interest means, Rate of Simple Interest (SI) is 10% per annum.

Method (1) Using Formula

Calculation of Simple Interest

Formula to Calculate Simple Interest

Simple Interest (SI) = Principal × Rate × Time

Thus, Simple Interest (SI) = $5200 × 10% × 10

= $5200 ×10/100 × 10

= 5200 × 10 × 10/100

= 52000 × 10/100

= 520000/100

= $5200

Thus, Simple Interest = $5200

Calculation of Amount

The total money paid to the lender by a borrower is called the Amount.

In other words, sum of priciple and interest is called the Amount.

Formula to Calculate the Amount

Amount = Principal + Interest

Thus, Amount = $5200 + $5200

= $10400

Thus, Amount to be paid = $10400 Answer

Method (2)

Calculation of Amount when Principal, Rate of Simple Interest and Time are given

Calculation of Amount directly using Principal, SI, and Time

Formula to calculate the Amount

Amount (A) = Principal (P) + Principal(P) × Rate of Interest (SI) × Time (t)

⇒ A = P + PRT

Here in the question, P = $5200

Rate of Simple Interest (SI) or (R) = 10%

And, Time (t) = 10 years

Thus, Amount (A)

= $5200 + ($5200 × 10% × 10)

= $5200 + ($5200 ×10/100 × 10)

= $5200 + (5200 × 10 × 10/100)

= $5200 + (52000 × 10/100)

= $5200 + (520000/100)

= $5200 + $5200 = $10400

Thus, Amount (A) to be paid = $10400 Answer

Method (3) Unitary Method

Calculation of Amount using Unitary Method

Calculation of Interest using Unitary Method

Here, given Rate of Simple Interest = 10%

This, means, $10 per $100 per year

∵ For $100, the simple interest for 1 year = $10

∴ For $1, the simple interest for 1 year = 10/100

∴ For $5200, the simple interest in 1 year

= 10/100 × 5200

= 10 × 5200/100

= 52000/100 = $520

Thus, simple interest for 1 year = $520

Therefore, simple interest for 10 years

= Simple interest for 1 year × 10

= $520 × 10 = $5200

Thus, Simple Interest (SI) = $5200

Calculation of Amount

Amount = Principal + Interest

Thus, Amount = $5200 + $5200

= $10400

Thus, Amount to be paid = $10400 Answer


Similar Questions

(1) Calculate the amount due after 10 years if Christopher borrowed a sum of $6000 at a rate of 2% simple interest.

(2) Sandra took a loan of $6900 at the rate of 8% simple interest per annum. If he paid an amount of $10212 to clear the loan, then find the time period of the loan.

(3) If Margaret paid $4872 to settle his loan which he had taken 4 years before at a simple interest of 3%, then find the loan taken.

(4) Michael took a loan of $4600 at the rate of 10% simple interest per annum. If he paid an amount of $7360 to clear the loan, then find the time period of the loan.

(5) Calculate the amount due after 10 years if Linda borrowed a sum of $5350 at a rate of 2% simple interest.

(6) Find the amount to be paid if William borrowed a sum of $5500 at 2% simple interest for 8 years.

(7) Calculate the amount due if Elizabeth borrowed a sum of $3450 at 10% simple interest for 3 years.

(8) Mary took a loan of $4100 at the rate of 9% simple interest per annum. If he paid an amount of $6314 to clear the loan, then find the time period of the loan.

(9) What amount will be due after 2 years if Steven borrowed a sum of $3800 at a 7% simple interest?

(10) If Kenneth paid $5600 to settle his loan which he had taken 4 years before at a simple interest of 3%, then find the loan taken.


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