Question:
What amount does Michael have to pay after 5 years if he takes a loan of $3300 at 6% simple interest?
Correct Answer
$4290
Solution And Explanation
Solution
Given,
Principal (P) = $3300
Rate of Simple Interest (SI) = 6%
Time (t) = 5 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) = $3300 × 6% × 5
= $3300 ×6/100 × 5
= 3300 × 6 × 5/100
= 19800 × 5/100
= 99000/100
= $990
Thus, Simple Interest = $990
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 + $990
= $4290
Thus, Amount to be paid = $4290 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) = 6%
And, Time (t) = 5 years
Thus, Amount (A)
= $3300 + ($3300 × 6% × 5)
= $3300 + ($3300 ×6/100 × 5)
= $3300 + (3300 × 6 × 5/100)
= $3300 + (19800 × 5/100)
= $3300 + (99000/100)
= $3300 + $990 = $4290
Thus, Amount (A) to be paid = $4290 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 $3300, the simple interest in 1 year
= 6/100 × 3300
= 6 × 3300/100
= 19800/100 = $198
Thus, simple interest for 1 year = $198
Therefore, simple interest for 5 years
= Simple interest for 1 year × 5
= $198 × 5 = $990
Thus, Simple Interest (SI) = $990
Calculation of Amount
Amount = Principal + Interest
Thus, Amount = $3300 + $990
= $4290
Thus, Amount to be paid = $4290 Answer
Similar Questions
(1) Calculate the amount due if Sarah borrowed a sum of $3850 at 4% simple interest for 4 years.
(2) Elizabeth took a loan of $4900 at the rate of 7% simple interest per annum. If he paid an amount of $6958 to clear the loan, then find the time period of the loan.
(3) Betty had to pay $4632.5 in order to furnish the loan taken 3 years before. If the rate of simple interest was 3% then find the sum borrowed.
(4) What amount will be due after 2 years if Daniel borrowed a sum of $3550 at a 7% simple interest?
(5) How much loan did Jennifer borrow 5 years ago at a rate of simple interest 2% per annum, if he paid $5775 to clear it?
(6) Calculate the amount due if Barbara borrowed a sum of $3550 at 10% simple interest for 3 years.
(7) How much loan did Margaret borrow 5 years ago at a rate of simple interest 2% per annum, if he paid $6985 to clear it?
(8) Daniel took a loan of $6200 at the rate of 10% simple interest per annum. If he paid an amount of $11160 to clear the loan, then find the time period of the loan.
(9) Find the amount to be paid if Richard borrowed a sum of $5600 at 4% simple interest for 7 years.
(10) Find the amount to be paid if Charles borrowed a sum of $5900 at 3% simple interest for 7 years.