Question:
What amount does Joseph have to pay after 6 years if he takes a loan of $3700 at 7% simple interest?
Correct Answer
$5254
Solution And Explanation
Solution
Given,
Principal (P) = $3700
Rate of Simple Interest (SI) = 7%
Time (t) = 6 years
Thus, Amount (A) = ?
The Rate of Interest is always calculated per annum, i.e. per year.
Thus, here 7% simple interest means, Rate of Simple Interest (SI) is 7% 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) = $3700 × 7% × 6
= $3700 ×7/100 × 6
= 3700 × 7 × 6/100
= 25900 × 6/100
= 155400/100
= $1554
Thus, Simple Interest = $1554
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 = $3700 + $1554
= $5254
Thus, Amount to be paid = $5254 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 = $3700
Rate of Simple Interest (SI) or (R) = 7%
And, Time (t) = 6 years
Thus, Amount (A)
= $3700 + ($3700 × 7% × 6)
= $3700 + ($3700 ×7/100 × 6)
= $3700 + (3700 × 7 × 6/100)
= $3700 + (25900 × 6/100)
= $3700 + (155400/100)
= $3700 + $1554 = $5254
Thus, Amount (A) to be paid = $5254 Answer
Method (3) Unitary Method
Calculation of Amount using Unitary Method
Calculation of Interest using Unitary Method
Here, given Rate of Simple Interest = 7%
This, means, $7 per $100 per year
∵ For $100, the simple interest for 1 year = $7
∴ For $1, the simple interest for 1 year = 7/100
∴ For $3700, the simple interest in 1 year
= 7/100 × 3700
= 7 × 3700/100
= 25900/100 = $259
Thus, simple interest for 1 year = $259
Therefore, simple interest for 6 years
= Simple interest for 1 year × 6
= $259 × 6 = $1554
Thus, Simple Interest (SI) = $1554
Calculation of Amount
Amount = Principal + Interest
Thus, Amount = $3700 + $1554
= $5254
Thus, Amount to be paid = $5254 Answer
Similar Questions
(1) Calculate the amount due after 10 years if Patricia borrowed a sum of $5150 at a rate of 8% simple interest.
(2) David took a loan of $4800 at the rate of 9% simple interest per annum. If he paid an amount of $7824 to clear the loan, then find the time period of the loan.
(3) Anthony took a loan of $6600 at the rate of 8% simple interest per annum. If he paid an amount of $11352 to clear the loan, then find the time period of the loan.
(4) Find the amount to be paid if Barbara borrowed a sum of $5550 at 5% simple interest for 7 years.
(5) Michael took a loan of $4600 at the rate of 6% simple interest per annum. If he paid an amount of $6808 to clear the loan, then find the time period of the loan.
(6) What amount does Sarah have to pay after 6 years if he takes a loan of $3850 at 7% simple interest?
(7) What amount does Barbara have to pay after 6 years if he takes a loan of $3550 at 6% simple interest?
(8) Calculate the amount due if Linda borrowed a sum of $3350 at 5% simple interest for 3 years.
(9) Calculate the amount due if William borrowed a sum of $3500 at 10% simple interest for 4 years.
(10) James took a loan of $4000 at the rate of 8% simple interest per annum. If he paid an amount of $6880 to clear the loan, then find the time period of the loan.