Question:
Find the amount to be paid if Linda borrowed a sum of $5350 at 5% simple interest for 8 years.
Correct Answer
$7490
Solution And Explanation
Solution
Given,
Principal (P) = $5350
Rate of Simple Interest (SI) = 5%
Time (t) = 8 years
Thus, Amount (A) = ?
The Rate of Interest is always calculated per annum, i.e. per year.
Thus, here 5% simple interest means, Rate of Simple Interest (SI) is 5% 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) = $5350 × 5% × 8
= $5350 ×5/100 × 8
= 5350 × 5 × 8/100
= 26750 × 8/100
= 214000/100
= $2140
Thus, Simple Interest = $2140
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 = $5350 + $2140
= $7490
Thus, Amount to be paid = $7490 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 = $5350
Rate of Simple Interest (SI) or (R) = 5%
And, Time (t) = 8 years
Thus, Amount (A)
= $5350 + ($5350 × 5% × 8)
= $5350 + ($5350 ×5/100 × 8)
= $5350 + (5350 × 5 × 8/100)
= $5350 + (26750 × 8/100)
= $5350 + (214000/100)
= $5350 + $2140 = $7490
Thus, Amount (A) to be paid = $7490 Answer
Method (3) Unitary Method
Calculation of Amount using Unitary Method
Calculation of Interest using Unitary Method
Here, given Rate of Simple Interest = 5%
This, means, $5 per $100 per year
∵ For $100, the simple interest for 1 year = $5
∴ For $1, the simple interest for 1 year = 5/100
∴ For $5350, the simple interest in 1 year
= 5/100 × 5350
= 5 × 5350/100
= 26750/100 = $267.5
Thus, simple interest for 1 year = $267.5
Therefore, simple interest for 8 years
= Simple interest for 1 year × 8
= $267.5 × 8 = $2140
Thus, Simple Interest (SI) = $2140
Calculation of Amount
Amount = Principal + Interest
Thus, Amount = $5350 + $2140
= $7490
Thus, Amount to be paid = $7490 Answer
Similar Questions
(1) Find the amount to be paid if Barbara borrowed a sum of $5550 at 5% simple interest for 7 years.
(2) What amount will be due after 2 years if Thomas borrowed a sum of $3400 at a 6% simple interest?
(3) Find the amount to be paid if John borrowed a sum of $5200 at 10% simple interest for 7 years.
(4) What amount does James have to pay after 6 years if he takes a loan of $3000 at 10% simple interest?
(5) Calculate the amount due if Michael borrowed a sum of $3300 at 9% simple interest for 3 years.
(6) David took a loan of $4800 at the rate of 7% simple interest per annum. If he paid an amount of $7824 to clear the loan, then find the time period of the loan.
(7) Find the amount to be paid if Jessica borrowed a sum of $5750 at 6% simple interest for 8 years.
(8) Calculate the amount due if Thomas borrowed a sum of $3800 at 9% simple interest for 3 years.
(9) What amount does David have to pay after 5 years if he takes a loan of $3400 at 6% simple interest?
(10) Find the amount to be paid if Susan borrowed a sum of $5650 at 4% simple interest for 8 years.