Question:
Calculate the amount due if Barbara borrowed a sum of $3550 at 9% simple interest for 3 years.
Correct Answer
$4508.5
Solution And Explanation
Solution
Given,
Principal (P) = $3550
Rate of Simple Interest (SI) = 9%
Time (t) = 3 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) = $3550 × 9% × 3
= $3550 ×9/100 × 3
= 3550 × 9 × 3/100
= 31950 × 3/100
= 95850/100
= $958.5
Thus, Simple Interest = $958.5
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 = $3550 + $958.5
= $4508.5
Thus, Amount to be paid = $4508.5 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 = $3550
Rate of Simple Interest (SI) or (R) = 9%
And, Time (t) = 3 years
Thus, Amount (A)
= $3550 + ($3550 × 9% × 3)
= $3550 + ($3550 ×9/100 × 3)
= $3550 + (3550 × 9 × 3/100)
= $3550 + (31950 × 3/100)
= $3550 + (95850/100)
= $3550 + $958.5 = $4508.5
Thus, Amount (A) to be paid = $4508.5 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 $3550, the simple interest in 1 year
= 9/100 × 3550
= 9 × 3550/100
= 31950/100 = $319.5
Thus, simple interest for 1 year = $319.5
Therefore, simple interest for 3 years
= Simple interest for 1 year × 3
= $319.5 × 3 = $958.5
Thus, Simple Interest (SI) = $958.5
Calculation of Amount
Amount = Principal + Interest
Thus, Amount = $3550 + $958.5
= $4508.5
Thus, Amount to be paid = $4508.5 Answer
Similar Questions
(1) Calculate the amount due if Richard borrowed a sum of $3600 at 5% simple interest for 3 years.
(2) Matthew took a loan of $6400 at the rate of 8% simple interest per annum. If he paid an amount of $11008 to clear the loan, then find the time period of the loan.
(3) Steven had to pay $5290 in order to furnish the loan taken 3 years before. If the rate of simple interest was 5% then find the sum borrowed.
(4) Calculate the amount due after 9 years if Richard borrowed a sum of $5600 at a rate of 7% simple interest.
(5) What amount does Joseph have to pay after 5 years if he takes a loan of $3700 at 2% simple interest?
(6) Find the amount to be paid if James borrowed a sum of $5000 at 10% simple interest for 8 years.
(7) John took a loan of $4400 at the rate of 8% simple interest per annum. If he paid an amount of $7568 to clear the loan, then find the time period of the loan.
(8) Michael took a loan of $4600 at the rate of 7% simple interest per annum. If he paid an amount of $7820 to clear the loan, then find the time period of the loan.
(9) What amount will be due after 2 years if David borrowed a sum of $3200 at a 9% simple interest?
(10) What amount does Sarah have to pay after 5 years if he takes a loan of $3850 at 6% simple interest?