Question:
What amount does David have to pay after 6 years if he takes a loan of $3400 at 8% simple interest?
Correct Answer
$5032
Solution And Explanation
Solution
Given,
Principal (P) = $3400
Rate of Simple Interest (SI) = 8%
Time (t) = 6 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) = $3400 × 8% × 6
= $3400 ×8/100 × 6
= 3400 × 8 × 6/100
= 27200 × 6/100
= 163200/100
= $1632
Thus, Simple Interest = $1632
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 = $3400 + $1632
= $5032
Thus, Amount to be paid = $5032 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 = $3400
Rate of Simple Interest (SI) or (R) = 8%
And, Time (t) = 6 years
Thus, Amount (A)
= $3400 + ($3400 × 8% × 6)
= $3400 + ($3400 ×8/100 × 6)
= $3400 + (3400 × 8 × 6/100)
= $3400 + (27200 × 6/100)
= $3400 + (163200/100)
= $3400 + $1632 = $5032
Thus, Amount (A) to be paid = $5032 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 $3400, the simple interest in 1 year
= 8/100 × 3400
= 8 × 3400/100
= 27200/100 = $272
Thus, simple interest for 1 year = $272
Therefore, simple interest for 6 years
= Simple interest for 1 year × 6
= $272 × 6 = $1632
Thus, Simple Interest (SI) = $1632
Calculation of Amount
Amount = Principal + Interest
Thus, Amount = $3400 + $1632
= $5032
Thus, Amount to be paid = $5032 Answer
Similar Questions
(1) How much loan did Dorothy borrow 5 years ago at a rate of simple interest 4% per annum, if he paid $8700 to clear it?
(2) If Matthew paid $4872 to settle his loan which he had taken 4 years before at a simple interest of 4%, then find the loan taken.
(3) Sandra took a loan of $6900 at the rate of 6% simple interest per annum. If he paid an amount of $10212 to clear the loan, then find the time period of the loan.
(4) What amount does Joseph have to pay after 5 years if he takes a loan of $3700 at 6% simple interest?
(5) Susan took a loan of $5300 at the rate of 7% simple interest per annum. If he paid an amount of $9010 to clear the loan, then find the time period of the loan.
(6) Calculate the amount due after 9 years if Patricia borrowed a sum of $5150 at a rate of 2% simple interest.
(7) What amount does Sarah have to pay after 5 years if he takes a loan of $3850 at 5% simple interest?
(8) Calculate the amount due if Mary borrowed a sum of $3050 at 6% simple interest for 3 years.
(9) Calculate the amount due if David borrowed a sum of $3400 at 4% simple interest for 4 years.
(10) In how much time a principal of $3100 will amount to $3410 at a simple interest of 2% per annum?