Question:
Calculate the amount due after 10 years if Karen borrowed a sum of $5950 at a rate of 3% simple interest.
Correct Answer
$7735
Solution And Explanation
Solution
Given,
Principal (P) = $5950
Rate of Simple Interest (SI) = 3%
Time (t) = 10 years
Thus, Amount (A) = ?
The Rate of Interest is always calculated per annum, i.e. per year.
Thus, here 3% simple interest means, Rate of Simple Interest (SI) is 3% 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) = $5950 × 3% × 10
= $5950 ×3/100 × 10
= 5950 × 3 × 10/100
= 17850 × 10/100
= 178500/100
= $1785
Thus, Simple Interest = $1785
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 = $5950 + $1785
= $7735
Thus, Amount to be paid = $7735 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 = $5950
Rate of Simple Interest (SI) or (R) = 3%
And, Time (t) = 10 years
Thus, Amount (A)
= $5950 + ($5950 × 3% × 10)
= $5950 + ($5950 ×3/100 × 10)
= $5950 + (5950 × 3 × 10/100)
= $5950 + (17850 × 10/100)
= $5950 + (178500/100)
= $5950 + $1785 = $7735
Thus, Amount (A) to be paid = $7735 Answer
Method (3) Unitary Method
Calculation of Amount using Unitary Method
Calculation of Interest using Unitary Method
Here, given Rate of Simple Interest = 3%
This, means, $3 per $100 per year
∵ For $100, the simple interest for 1 year = $3
∴ For $1, the simple interest for 1 year = 3/100
∴ For $5950, the simple interest in 1 year
= 3/100 × 5950
= 3 × 5950/100
= 17850/100 = $178.5
Thus, simple interest for 1 year = $178.5
Therefore, simple interest for 10 years
= Simple interest for 1 year × 10
= $178.5 × 10 = $1785
Thus, Simple Interest (SI) = $1785
Calculation of Amount
Amount = Principal + Interest
Thus, Amount = $5950 + $1785
= $7735
Thus, Amount to be paid = $7735 Answer
Similar Questions
(1) Richard had to pay $4032 in order to furnish the loan taken 3 years before. If the rate of simple interest was 4% then find the sum borrowed.
(2) In how much time a principal of $3200 will amount to $3456 at a simple interest of 2% per annum?
(3) Find the amount to be paid if Mary borrowed a sum of $5050 at 10% simple interest for 8 years.
(4) Calculate the amount due if David borrowed a sum of $3400 at 7% simple interest for 4 years.
(5) If William borrowed $3500 from a bank at a rate of 2% simple interest per annum then find the amount to be paid after 2 years.
(6) If Richard borrowed $3600 from a bank at a rate of 3% simple interest per annum then find the amount to be paid after 2 years.
(7) Calculate the amount due if Richard borrowed a sum of $3600 at 10% simple interest for 3 years.
(8) Calculate the amount due after 10 years if James borrowed a sum of $5000 at a rate of 3% simple interest.
(9) Find the amount to be paid if Jessica borrowed a sum of $5750 at 4% simple interest for 8 years.
(10) William took a loan of $5000 at the rate of 6% simple interest per annum. If he paid an amount of $7100 to clear the loan, then find the time period of the loan.