Question:
Calculate the amount due if Michael borrowed a sum of $3300 at 6% simple interest for 4 years.
Correct Answer
$4092
Solution And Explanation
Solution
Given,
Principal (P) = $3300
Rate of Simple Interest (SI) = 6%
Time (t) = 4 years
Thus, Amount (A) = ?
The Rate of Interest is always calculated per annum, i.e. per year.
Thus, here 6% simple interest means, Rate of Simple Interest (SI) is 6% 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) = $3300 × 6% × 4
= $3300 ×6/100 × 4
= 3300 × 6 × 4/100
= 19800 × 4/100
= 79200/100
= $792
Thus, Simple Interest = $792
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 = $3300 + $792
= $4092
Thus, Amount to be paid = $4092 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 = $3300
Rate of Simple Interest (SI) or (R) = 6%
And, Time (t) = 4 years
Thus, Amount (A)
= $3300 + ($3300 × 6% × 4)
= $3300 + ($3300 ×6/100 × 4)
= $3300 + (3300 × 6 × 4/100)
= $3300 + (19800 × 4/100)
= $3300 + (79200/100)
= $3300 + $792 = $4092
Thus, Amount (A) to be paid = $4092 Answer
Method (3) Unitary Method
Calculation of Amount using Unitary Method
Calculation of Interest using Unitary Method
Here, given Rate of Simple Interest = 6%
This, means, $6 per $100 per year
∵ For $100, the simple interest for 1 year = $6
∴ For $1, the simple interest for 1 year = 6/100
∴ For $3300, the simple interest in 1 year
= 6/100 × 3300
= 6 × 3300/100
= 19800/100 = $198
Thus, simple interest for 1 year = $198
Therefore, simple interest for 4 years
= Simple interest for 1 year × 4
= $198 × 4 = $792
Thus, Simple Interest (SI) = $792
Calculation of Amount
Amount = Principal + Interest
Thus, Amount = $3300 + $792
= $4092
Thus, Amount to be paid = $4092 Answer
Similar Questions
(1) What amount will be due after 2 years if Robert borrowed a sum of $3050 at a 7% simple interest?
(2) What amount does John have to pay after 5 years if he takes a loan of $3200 at 4% simple interest?
(3) Barbara took a loan of $5100 at the rate of 9% simple interest per annum. If he paid an amount of $8772 to clear the loan, then find the time period of the loan.
(4) Calculate the amount due after 9 years if James borrowed a sum of $5000 at a rate of 6% simple interest.
(5) Calculate the amount due after 9 years if Charles borrowed a sum of $5900 at a rate of 10% simple interest.
(6) How much loan did Kimberly borrow 5 years ago at a rate of simple interest 3% per annum, if he paid $7647.5 to clear it?
(7) How much loan did Rebecca borrow 5 years ago at a rate of simple interest 3% per annum, if he paid $8797.5 to clear it?
(8) What amount does Sarah have to pay after 6 years if he takes a loan of $3850 at 10% simple interest?
(9) Thomas took a loan of $5600 at the rate of 6% simple interest per annum. If he paid an amount of $7952 to clear the loan, then find the time period of the loan.
(10) Calculate the amount due after 9 years if John borrowed a sum of $5200 at a rate of 4% simple interest.