Question:
Calculate the amount due if Susan borrowed a sum of $3650 at 8% simple interest for 3 years.
Correct Answer
$4526
Solution And Explanation
Solution
Given,
Principal (P) = $3650
Rate of Simple Interest (SI) = 8%
Time (t) = 3 years
Thus, Amount (A) = ?
The Rate of Interest is always calculated per annum, i.e. per year.
Thus, here 8% simple interest means, Rate of Simple Interest (SI) is 8% 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) = $3650 × 8% × 3
= $3650 ×8/100 × 3
= 3650 × 8 × 3/100
= 29200 × 3/100
= 87600/100
= $876
Thus, Simple Interest = $876
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 = $3650 + $876
= $4526
Thus, Amount to be paid = $4526 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 = $3650
Rate of Simple Interest (SI) or (R) = 8%
And, Time (t) = 3 years
Thus, Amount (A)
= $3650 + ($3650 × 8% × 3)
= $3650 + ($3650 ×8/100 × 3)
= $3650 + (3650 × 8 × 3/100)
= $3650 + (29200 × 3/100)
= $3650 + (87600/100)
= $3650 + $876 = $4526
Thus, Amount (A) to be paid = $4526 Answer
Method (3) Unitary Method
Calculation of Amount using Unitary Method
Calculation of Interest using Unitary Method
Here, given Rate of Simple Interest = 8%
This, means, $8 per $100 per year
∵ For $100, the simple interest for 1 year = $8
∴ For $1, the simple interest for 1 year = 8/100
∴ For $3650, the simple interest in 1 year
= 8/100 × 3650
= 8 × 3650/100
= 29200/100 = $292
Thus, simple interest for 1 year = $292
Therefore, simple interest for 3 years
= Simple interest for 1 year × 3
= $292 × 3 = $876
Thus, Simple Interest (SI) = $876
Calculation of Amount
Amount = Principal + Interest
Thus, Amount = $3650 + $876
= $4526
Thus, Amount to be paid = $4526 Answer
Similar Questions
(1) Donald took a loan of $7000 at the rate of 8% simple interest per annum. If he paid an amount of $12600 to clear the loan, then find the time period of the loan.
(2) In how much time a principal of $3200 will amount to $3584 at a simple interest of 4% per annum?
(3) Calculate the amount due after 9 years if Mary borrowed a sum of $5050 at a rate of 7% simple interest.
(4) Calculate the amount due if Sarah borrowed a sum of $3850 at 7% simple interest for 3 years.
(5) Find the amount to be paid if Robert borrowed a sum of $5100 at 8% simple interest for 8 years.
(6) Calculate the amount due after 9 years if Joseph borrowed a sum of $5700 at a rate of 10% simple interest.
(7) Calculate the amount due after 9 years if Christopher borrowed a sum of $6000 at a rate of 8% simple interest.
(8) Find the amount to be paid if Mary borrowed a sum of $5050 at 9% simple interest for 8 years.
(9) Find the amount to be paid if James borrowed a sum of $5000 at 6% simple interest for 8 years.
(10) Calculate the amount due if Michael borrowed a sum of $3300 at 10% simple interest for 3 years.