Question:
Calculate the amount due after 9 years if Richard borrowed a sum of $5600 at a rate of 4% simple interest.
Correct Answer
$7616
Solution And Explanation
Solution
Given,
Principal (P) = $5600
Rate of Simple Interest (SI) = 4%
Time (t) = 9 years
Thus, Amount (A) = ?
The Rate of Interest is always calculated per annum, i.e. per year.
Thus, here 4% simple interest means, Rate of Simple Interest (SI) is 4% 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) = $5600 × 4% × 9
= $5600 ×4/100 × 9
= 5600 × 4 × 9/100
= 22400 × 9/100
= 201600/100
= $2016
Thus, Simple Interest = $2016
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 = $5600 + $2016
= $7616
Thus, Amount to be paid = $7616 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 = $5600
Rate of Simple Interest (SI) or (R) = 4%
And, Time (t) = 9 years
Thus, Amount (A)
= $5600 + ($5600 × 4% × 9)
= $5600 + ($5600 ×4/100 × 9)
= $5600 + (5600 × 4 × 9/100)
= $5600 + (22400 × 9/100)
= $5600 + (201600/100)
= $5600 + $2016 = $7616
Thus, Amount (A) to be paid = $7616 Answer
Method (3) Unitary Method
Calculation of Amount using Unitary Method
Calculation of Interest using Unitary Method
Here, given Rate of Simple Interest = 4%
This, means, $4 per $100 per year
∵ For $100, the simple interest for 1 year = $4
∴ For $1, the simple interest for 1 year = 4/100
∴ For $5600, the simple interest in 1 year
= 4/100 × 5600
= 4 × 5600/100
= 22400/100 = $224
Thus, simple interest for 1 year = $224
Therefore, simple interest for 9 years
= Simple interest for 1 year × 9
= $224 × 9 = $2016
Thus, Simple Interest (SI) = $2016
Calculation of Amount
Amount = Principal + Interest
Thus, Amount = $5600 + $2016
= $7616
Thus, Amount to be paid = $7616 Answer
Similar Questions
(1) Betty took a loan of $6500 at the rate of 7% simple interest per annum. If he paid an amount of $9685 to clear the loan, then find the time period of the loan.
(2) Anthony took a loan of $6600 at the rate of 7% simple interest per annum. If he paid an amount of $9834 to clear the loan, then find the time period of the loan.
(3) Calculate the amount due if Thomas borrowed a sum of $3800 at 10% simple interest for 3 years.
(4) Margaret took a loan of $6700 at the rate of 7% simple interest per annum. If he paid an amount of $9983 to clear the loan, then find the time period of the loan.
(5) Sandra had to pay $5117.5 in order to furnish the loan taken 3 years before. If the rate of simple interest was 5% then find the sum borrowed.
(6) What amount does Patricia have to pay after 5 years if he takes a loan of $3150 at 2% simple interest?
(7) Find the amount to be paid if Karen borrowed a sum of $5950 at 6% simple interest for 8 years.
(8) Calculate the amount due after 10 years if Michael borrowed a sum of $5300 at a rate of 8% simple interest.
(9) Susan took a loan of $5300 at the rate of 8% simple interest per annum. If he paid an amount of $8268 to clear the loan, then find the time period of the loan.
(10) What amount does William have to pay after 5 years if he takes a loan of $3500 at 9% simple interest?