Question:
What amount does Sarah have to pay after 5 years if he takes a loan of $3850 at 3% simple interest?
Correct Answer
$4427.5
Solution And Explanation
Solution
Given,
Principal (P) = $3850
Rate of Simple Interest (SI) = 3%
Time (t) = 5 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) = $3850 × 3% × 5
= $3850 ×3/100 × 5
= 3850 × 3 × 5/100
= 11550 × 5/100
= 57750/100
= $577.5
Thus, Simple Interest = $577.5
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 = $3850 + $577.5
= $4427.5
Thus, Amount to be paid = $4427.5 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 = $3850
Rate of Simple Interest (SI) or (R) = 3%
And, Time (t) = 5 years
Thus, Amount (A)
= $3850 + ($3850 × 3% × 5)
= $3850 + ($3850 ×3/100 × 5)
= $3850 + (3850 × 3 × 5/100)
= $3850 + (11550 × 5/100)
= $3850 + (57750/100)
= $3850 + $577.5 = $4427.5
Thus, Amount (A) to be paid = $4427.5 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 $3850, the simple interest in 1 year
= 3/100 × 3850
= 3 × 3850/100
= 11550/100 = $115.5
Thus, simple interest for 1 year = $115.5
Therefore, simple interest for 5 years
= Simple interest for 1 year × 5
= $115.5 × 5 = $577.5
Thus, Simple Interest (SI) = $577.5
Calculation of Amount
Amount = Principal + Interest
Thus, Amount = $3850 + $577.5
= $4427.5
Thus, Amount to be paid = $4427.5 Answer
Similar Questions
(1) Jessica had to pay $4312.5 in order to furnish the loan taken 3 years before. If the rate of simple interest was 5% then find the sum borrowed.
(2) Calculate the amount due if Susan borrowed a sum of $3650 at 4% simple interest for 4 years.
(3) Matthew took a loan of $6400 at the rate of 7% simple interest per annum. If he paid an amount of $10880 to clear the loan, then find the time period of the loan.
(4) What amount does Mary have to pay after 5 years if he takes a loan of $3050 at 8% simple interest?
(5) Calculate the amount due if William borrowed a sum of $3500 at 9% simple interest for 3 years.
(6) How much loan did Michael borrow 5 years ago at a rate of simple interest 4% per annum, if he paid $6360 to clear it?
(7) What amount does Sarah have to pay after 5 years if he takes a loan of $3850 at 5% simple interest?
(8) How much loan did Cynthia borrow 5 years ago at a rate of simple interest 2% per annum, if he paid $8745 to clear it?
(9) Calculate the amount due after 10 years if Sarah borrowed a sum of $5850 at a rate of 2% simple interest.
(10) Michael took a loan of $4600 at the rate of 9% simple interest per annum. If he paid an amount of $8326 to clear the loan, then find the time period of the loan.