Question:
Calculate the amount due if Joseph borrowed a sum of $3700 at 6% simple interest for 4 years.
Correct Answer
$4588
Solution And Explanation
Solution
Given,
Principal (P) = $3700
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) = $3700 × 6% × 4
= $3700 ×6/100 × 4
= 3700 × 6 × 4/100
= 22200 × 4/100
= 88800/100
= $888
Thus, Simple Interest = $888
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 + $888
= $4588
Thus, Amount to be paid = $4588 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) = 6%
And, Time (t) = 4 years
Thus, Amount (A)
= $3700 + ($3700 × 6% × 4)
= $3700 + ($3700 ×6/100 × 4)
= $3700 + (3700 × 6 × 4/100)
= $3700 + (22200 × 4/100)
= $3700 + (88800/100)
= $3700 + $888 = $4588
Thus, Amount (A) to be paid = $4588 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 $3700, the simple interest in 1 year
= 6/100 × 3700
= 6 × 3700/100
= 22200/100 = $222
Thus, simple interest for 1 year = $222
Therefore, simple interest for 4 years
= Simple interest for 1 year × 4
= $222 × 4 = $888
Thus, Simple Interest (SI) = $888
Calculation of Amount
Amount = Principal + Interest
Thus, Amount = $3700 + $888
= $4588
Thus, Amount to be paid = $4588 Answer
Similar Questions
(1) Find the amount to be paid if Richard borrowed a sum of $5600 at 6% simple interest for 7 years.
(2) What amount does Karen have to pay after 6 years if he takes a loan of $3950 at 5% simple interest?
(3) Calculate the amount due if James borrowed a sum of $3000 at 10% simple interest for 4 years.
(4) Calculate the amount due after 10 years if Elizabeth borrowed a sum of $5450 at a rate of 10% simple interest.
(5) Calculate the amount due if Elizabeth borrowed a sum of $3450 at 4% simple interest for 3 years.
(6) How much loan did William borrow 5 years ago at a rate of simple interest 2% per annum, if he paid $6050 to clear it?
(7) Barbara took a loan of $5100 at the rate of 8% simple interest per annum. If he paid an amount of $8772 to clear the loan, then find the time period of the loan.
(8) In how much time a principal of $3000 will amount to $3240 at a simple interest of 2% per annum?
(9) Calculate the amount due after 10 years if Elizabeth borrowed a sum of $5450 at a rate of 6% simple interest.
(10) In how much time a principal of $3100 will amount to $3286 at a simple interest of 3% per annum?