Question:
Calculate the amount due after 9 years if Sarah borrowed a sum of $5850 at a rate of 8% simple interest.
Correct Answer
$10062
Solution And Explanation
Solution
Given,
Principal (P) = $5850
Rate of Simple Interest (SI) = 8%
Time (t) = 9 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) = $5850 × 8% × 9
= $5850 ×8/100 × 9
= 5850 × 8 × 9/100
= 46800 × 9/100
= 421200/100
= $4212
Thus, Simple Interest = $4212
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 = $5850 + $4212
= $10062
Thus, Amount to be paid = $10062 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 = $5850
Rate of Simple Interest (SI) or (R) = 8%
And, Time (t) = 9 years
Thus, Amount (A)
= $5850 + ($5850 × 8% × 9)
= $5850 + ($5850 ×8/100 × 9)
= $5850 + (5850 × 8 × 9/100)
= $5850 + (46800 × 9/100)
= $5850 + (421200/100)
= $5850 + $4212 = $10062
Thus, Amount (A) to be paid = $10062 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 $5850, the simple interest in 1 year
= 8/100 × 5850
= 8 × 5850/100
= 46800/100 = $468
Thus, simple interest for 1 year = $468
Therefore, simple interest for 9 years
= Simple interest for 1 year × 9
= $468 × 9 = $4212
Thus, Simple Interest (SI) = $4212
Calculation of Amount
Amount = Principal + Interest
Thus, Amount = $5850 + $4212
= $10062
Thus, Amount to be paid = $10062 Answer
Similar Questions
(1) Calculate the amount due after 10 years if Sarah borrowed a sum of $5850 at a rate of 4% simple interest.
(2) How much loan did Linda borrow 5 years ago at a rate of simple interest 2% per annum, if he paid $5885 to clear it?
(3) Calculate the amount due after 10 years if Elizabeth borrowed a sum of $5450 at a rate of 10% simple interest.
(4) If Michael paid $3696 to settle his loan which he had taken 4 years before at a simple interest of 3%, then find the loan taken.
(5) Calculate the amount due if Linda borrowed a sum of $3350 at 9% simple interest for 3 years.
(6) Find the amount to be paid if John borrowed a sum of $5200 at 6% simple interest for 8 years.
(7) Find the amount to be paid if James borrowed a sum of $5000 at 5% simple interest for 7 years.
(8) Calculate the amount due if Richard borrowed a sum of $3600 at 5% simple interest for 3 years.
(9) What amount does Sarah have to pay after 5 years if he takes a loan of $3850 at 6% simple interest?
(10) What amount does Linda have to pay after 5 years if he takes a loan of $3350 at 7% simple interest?