Question:
Find the amount to be paid if Charles borrowed a sum of $5900 at 10% simple interest for 8 years.
Correct Answer
$10620
Solution And Explanation
Solution
Given,
Principal (P) = $5900
Rate of Simple Interest (SI) = 10%
Time (t) = 8 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) = $5900 × 10% × 8
= $5900 ×10/100 × 8
= 5900 × 10 × 8/100
= 59000 × 8/100
= 472000/100
= $4720
Thus, Simple Interest = $4720
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 = $5900 + $4720
= $10620
Thus, Amount to be paid = $10620 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 = $5900
Rate of Simple Interest (SI) or (R) = 10%
And, Time (t) = 8 years
Thus, Amount (A)
= $5900 + ($5900 × 10% × 8)
= $5900 + ($5900 ×10/100 × 8)
= $5900 + (5900 × 10 × 8/100)
= $5900 + (59000 × 8/100)
= $5900 + (472000/100)
= $5900 + $4720 = $10620
Thus, Amount (A) to be paid = $10620 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 $5900, the simple interest in 1 year
= 10/100 × 5900
= 10 × 5900/100
= 59000/100 = $590
Thus, simple interest for 1 year = $590
Therefore, simple interest for 8 years
= Simple interest for 1 year × 8
= $590 × 8 = $4720
Thus, Simple Interest (SI) = $4720
Calculation of Amount
Amount = Principal + Interest
Thus, Amount = $5900 + $4720
= $10620
Thus, Amount to be paid = $10620 Answer
Similar Questions
(1) What amount does Joseph have to pay after 5 years if he takes a loan of $3700 at 8% simple interest?
(2) Find the amount to be paid if Susan borrowed a sum of $5650 at 9% simple interest for 8 years.
(3) Find the amount to be paid if Barbara borrowed a sum of $5550 at 9% simple interest for 7 years.
(4) Calculate the amount due after 9 years if Jessica borrowed a sum of $5750 at a rate of 6% simple interest.
(5) Mark took a loan of $6800 at the rate of 6% simple interest per annum. If he paid an amount of $10064 to clear the loan, then find the time period of the loan.
(6) Anthony had to pay $4687 in order to furnish the loan taken 3 years before. If the rate of simple interest was 3% then find the sum borrowed.
(7) What amount will be due after 2 years if Michael borrowed a sum of $3150 at a 4% simple interest?
(8) Jessica took a loan of $5500 at the rate of 8% simple interest per annum. If he paid an amount of $9460 to clear the loan, then find the time period of the loan.
(9) What amount does David have to pay after 5 years if he takes a loan of $3400 at 8% simple interest?
(10) Daniel took a loan of $6200 at the rate of 7% simple interest per annum. If he paid an amount of $9672 to clear the loan, then find the time period of the loan.