Question:
Find the amount to be paid if Karen borrowed a sum of $5950 at 9% simple interest for 7 years.
Correct Answer
$9698.5
Solution And Explanation
Solution
Given,
Principal (P) = $5950
Rate of Simple Interest (SI) = 9%
Time (t) = 7 years
Thus, Amount (A) = ?
The Rate of Interest is always calculated per annum, i.e. per year.
Thus, here 9% simple interest means, Rate of Simple Interest (SI) is 9% 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) = $5950 × 9% × 7
= $5950 ×9/100 × 7
= 5950 × 9 × 7/100
= 53550 × 7/100
= 374850/100
= $3748.5
Thus, Simple Interest = $3748.5
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 = $5950 + $3748.5
= $9698.5
Thus, Amount to be paid = $9698.5 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 = $5950
Rate of Simple Interest (SI) or (R) = 9%
And, Time (t) = 7 years
Thus, Amount (A)
= $5950 + ($5950 × 9% × 7)
= $5950 + ($5950 ×9/100 × 7)
= $5950 + (5950 × 9 × 7/100)
= $5950 + (53550 × 7/100)
= $5950 + (374850/100)
= $5950 + $3748.5 = $9698.5
Thus, Amount (A) to be paid = $9698.5 Answer
Method (3) Unitary Method
Calculation of Amount using Unitary Method
Calculation of Interest using Unitary Method
Here, given Rate of Simple Interest = 9%
This, means, $9 per $100 per year
∵ For $100, the simple interest for 1 year = $9
∴ For $1, the simple interest for 1 year = 9/100
∴ For $5950, the simple interest in 1 year
= 9/100 × 5950
= 9 × 5950/100
= 53550/100 = $535.5
Thus, simple interest for 1 year = $535.5
Therefore, simple interest for 7 years
= Simple interest for 1 year × 7
= $535.5 × 7 = $3748.5
Thus, Simple Interest (SI) = $3748.5
Calculation of Amount
Amount = Principal + Interest
Thus, Amount = $5950 + $3748.5
= $9698.5
Thus, Amount to be paid = $9698.5 Answer
Similar Questions
(1) If Emily paid $5130 to settle his loan which he had taken 4 years before at a simple interest of 2%, then find the loan taken.
(2) What amount does Karen have to pay after 5 years if he takes a loan of $3950 at 9% simple interest?
(3) David took a loan of $4800 at the rate of 10% simple interest per annum. If he paid an amount of $9600 to clear the loan, then find the time period of the loan.
(4) How much loan did David borrow 5 years ago at a rate of simple interest 4% per annum, if he paid $6480 to clear it?
(5) Calculate the amount due if David borrowed a sum of $3400 at 5% simple interest for 4 years.
(6) Elizabeth took a loan of $4900 at the rate of 6% simple interest per annum. If he paid an amount of $7840 to clear the loan, then find the time period of the loan.
(7) Calculate the amount due after 9 years if Linda borrowed a sum of $5350 at a rate of 8% simple interest.
(8) If Barbara borrowed $3550 from a bank at a rate of 2% simple interest per annum then find the amount to be paid after 2 years.
(9) Find the amount to be paid if Jessica borrowed a sum of $5750 at 7% simple interest for 8 years.
(10) Calculate the amount due after 10 years if David borrowed a sum of $5400 at a rate of 5% simple interest.