Question:
What amount does Barbara have to pay after 6 years if he takes a loan of $3550 at 4% simple interest?
Correct Answer
$4402
Solution And Explanation
Solution
Given,
Principal (P) = $3550
Rate of Simple Interest (SI) = 4%
Time (t) = 6 years
Thus, Amount (A) = ?
The Rate of Interest is always calculated per annum, i.e. per year.
Thus, here 4% simple interest means, Rate of Simple Interest (SI) is 4% 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) = $3550 × 4% × 6
= $3550 ×4/100 × 6
= 3550 × 4 × 6/100
= 14200 × 6/100
= 85200/100
= $852
Thus, Simple Interest = $852
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 = $3550 + $852
= $4402
Thus, Amount to be paid = $4402 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 = $3550
Rate of Simple Interest (SI) or (R) = 4%
And, Time (t) = 6 years
Thus, Amount (A)
= $3550 + ($3550 × 4% × 6)
= $3550 + ($3550 ×4/100 × 6)
= $3550 + (3550 × 4 × 6/100)
= $3550 + (14200 × 6/100)
= $3550 + (85200/100)
= $3550 + $852 = $4402
Thus, Amount (A) to be paid = $4402 Answer
Method (3) Unitary Method
Calculation of Amount using Unitary Method
Calculation of Interest using Unitary Method
Here, given Rate of Simple Interest = 4%
This, means, $4 per $100 per year
∵ For $100, the simple interest for 1 year = $4
∴ For $1, the simple interest for 1 year = 4/100
∴ For $3550, the simple interest in 1 year
= 4/100 × 3550
= 4 × 3550/100
= 14200/100 = $142
Thus, simple interest for 1 year = $142
Therefore, simple interest for 6 years
= Simple interest for 1 year × 6
= $142 × 6 = $852
Thus, Simple Interest (SI) = $852
Calculation of Amount
Amount = Principal + Interest
Thus, Amount = $3550 + $852
= $4402
Thus, Amount to be paid = $4402 Answer
Similar Questions
(1) Patricia took a loan of $4300 at the rate of 10% simple interest per annum. If he paid an amount of $7310 to clear the loan, then find the time period of the loan.
(2) Margaret took a loan of $6700 at the rate of 6% simple interest per annum. If he paid an amount of $10720 to clear the loan, then find the time period of the loan.
(3) How much loan did David borrow 5 years ago at a rate of simple interest 3% per annum, if he paid $6210 to clear it?
(4) Find the amount to be paid if Mary borrowed a sum of $5050 at 5% simple interest for 8 years.
(5) In how much time a principal of $3200 will amount to $3328 at a simple interest of 2% per annum?
(6) If Sandra paid $5162 to settle his loan which he had taken 4 years before at a simple interest of 4%, then find the loan taken.
(7) Calculate the amount due after 9 years if James borrowed a sum of $5000 at a rate of 2% simple interest.
(8) What amount does David have to pay after 6 years if he takes a loan of $3400 at 4% simple interest?
(9) How much loan did Kevin borrow 5 years ago at a rate of simple interest 5% per annum, if he paid $8875 to clear it?
(10) Mark took a loan of $6800 at the rate of 9% simple interest per annum. If he paid an amount of $12308 to clear the loan, then find the time period of the loan.