Question:
What amount does Michael have to pay after 5 years if he takes a loan of $3300 at 7% simple interest?
Correct Answer
$4455
Solution And Explanation
Solution
Given,
Principal (P) = $3300
Rate of Simple Interest (SI) = 7%
Time (t) = 5 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) = $3300 × 7% × 5
= $3300 ×7/100 × 5
= 3300 × 7 × 5/100
= 23100 × 5/100
= 115500/100
= $1155
Thus, Simple Interest = $1155
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 + $1155
= $4455
Thus, Amount to be paid = $4455 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) = 7%
And, Time (t) = 5 years
Thus, Amount (A)
= $3300 + ($3300 × 7% × 5)
= $3300 + ($3300 ×7/100 × 5)
= $3300 + (3300 × 7 × 5/100)
= $3300 + (23100 × 5/100)
= $3300 + (115500/100)
= $3300 + $1155 = $4455
Thus, Amount (A) to be paid = $4455 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 $3300, the simple interest in 1 year
= 7/100 × 3300
= 7 × 3300/100
= 23100/100 = $231
Thus, simple interest for 1 year = $231
Therefore, simple interest for 5 years
= Simple interest for 1 year × 5
= $231 × 5 = $1155
Thus, Simple Interest (SI) = $1155
Calculation of Amount
Amount = Principal + Interest
Thus, Amount = $3300 + $1155
= $4455
Thus, Amount to be paid = $4455 Answer
Similar Questions
(1) What amount does Mary have to pay after 5 years if he takes a loan of $3050 at 3% simple interest?
(2) Linda took a loan of $4700 at the rate of 8% simple interest per annum. If he paid an amount of $7332 to clear the loan, then find the time period of the loan.
(3) Calculate the amount due if Jennifer borrowed a sum of $3250 at 2% simple interest for 3 years.
(4) How much loan did Ryan borrow 5 years ago at a rate of simple interest 5% per annum, if he paid $9875 to clear it?
(5) What amount does Sarah have to pay after 6 years if he takes a loan of $3850 at 4% simple interest?
(6) What amount will be due after 2 years if Kenneth borrowed a sum of $4000 at a 10% simple interest?
(7) Calculate the amount due after 10 years if Michael borrowed a sum of $5300 at a rate of 10% simple interest.
(8) Richard took a loan of $5200 at the rate of 8% simple interest per annum. If he paid an amount of $8112 to clear the loan, then find the time period of the loan.
(9) Calculate the amount due if Jessica borrowed a sum of $3750 at 10% simple interest for 4 years.
(10) What amount does John have to pay after 6 years if he takes a loan of $3200 at 4% simple interest?