Question:
Calculate the amount due after 10 years if Charles borrowed a sum of $5900 at a rate of 6% simple interest.
Correct Answer
$9440
Solution And Explanation
Solution
Given,
Principal (P) = $5900
Rate of Simple Interest (SI) = 6%
Time (t) = 10 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) = $5900 × 6% × 10
= $5900 ×6/100 × 10
= 5900 × 6 × 10/100
= 35400 × 10/100
= 354000/100
= $3540
Thus, Simple Interest = $3540
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 = $5900 + $3540
= $9440
Thus, Amount to be paid = $9440 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 = $5900
Rate of Simple Interest (SI) or (R) = 6%
And, Time (t) = 10 years
Thus, Amount (A)
= $5900 + ($5900 × 6% × 10)
= $5900 + ($5900 ×6/100 × 10)
= $5900 + (5900 × 6 × 10/100)
= $5900 + (35400 × 10/100)
= $5900 + (354000/100)
= $5900 + $3540 = $9440
Thus, Amount (A) to be paid = $9440 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 $5900, the simple interest in 1 year
= 6/100 × 5900
= 6 × 5900/100
= 35400/100 = $354
Thus, simple interest for 1 year = $354
Therefore, simple interest for 10 years
= Simple interest for 1 year × 10
= $354 × 10 = $3540
Thus, Simple Interest (SI) = $3540
Calculation of Amount
Amount = Principal + Interest
Thus, Amount = $5900 + $3540
= $9440
Thus, Amount to be paid = $9440 Answer
Similar Questions
(1) How much loan did George borrow 5 years ago at a rate of simple interest 3% per annum, if he paid $8395 to clear it?
(2) What amount does Patricia have to pay after 5 years if he takes a loan of $3150 at 2% simple interest?
(3) Find the amount to be paid if Patricia borrowed a sum of $5150 at 5% simple interest for 8 years.
(4) Calculate the amount due if Karen borrowed a sum of $3950 at 9% simple interest for 3 years.
(5) Donald took a loan of $7000 at the rate of 9% simple interest per annum. If he paid an amount of $13300 to clear the loan, then find the time period of the loan.
(6) Calculate the amount due if Richard borrowed a sum of $3600 at 7% simple interest for 4 years.
(7) Calculate the amount due if Christopher borrowed a sum of $4000 at 9% simple interest for 3 years.
(8) Find the amount to be paid if Joseph borrowed a sum of $5700 at 2% simple interest for 7 years.
(9) John took a loan of $4400 at the rate of 9% simple interest per annum. If he paid an amount of $7172 to clear the loan, then find the time period of the loan.
(10) What amount does Linda have to pay after 5 years if he takes a loan of $3350 at 10% simple interest?