Question:
If Susan borrowed $3650 from a bank at a rate of 2% simple interest per annum then find the amount to be paid after 2 years.
Correct Answer
$3796
Solution And Explanation
Solution
Given,
Principal (P) = $3650
Rate of Simple Interest (SI) = 2%
Time (t) = 2 years
Thus, Amount (A) = ?
The Rate of Interest is always calculated per annum, i.e. per year.
Thus, here 2% simple interest means, Rate of Simple Interest (SI) is 2% 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) = $3650 × 2% × 2
= $3650 ×2/100 × 2
= 3650 × 2 × 2/100
= 7300 × 2/100
= 14600/100
= $146
Thus, Simple Interest = $146
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 = $3650 + $146
= $3796
Thus, Amount to be paid = $3796 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 = $3650
Rate of Simple Interest (SI) or (R) = 2%
And, Time (t) = 2 years
Thus, Amount (A)
= $3650 + ($3650 × 2% × 2)
= $3650 + ($3650 ×2/100 × 2)
= $3650 + (3650 × 2 × 2/100)
= $3650 + (7300 × 2/100)
= $3650 + (14600/100)
= $3650 + $146 = $3796
Thus, Amount (A) to be paid = $3796 Answer
Method (3) Unitary Method
Calculation of Amount using Unitary Method
Calculation of Interest using Unitary Method
Here, given Rate of Simple Interest = 2%
This, means, $2 per $100 per year
∵ For $100, the simple interest in 1 year = $2
∴ For $1, the simple interest in 1 year = 2/100
∴ For $3650, the simple interest in 1 year
= 2/100 × 3650
= 2 × 3650/100
= 7300/100 = $73
Thus, simple interest in 1 year = $73
Therefore, simple interest for 2 years
= Simple interest for 1 year × 2
= $73 × 2 = $146
Thus, Simple Interest (SI) = $146
Calculation of Amount
Amount = Principal + Interest
Thus, Amount = $3650 + $146
= $3796
Thus, Amount to be paid = $3796 Answer
Similar Questions
(1) Paul had to pay $5405 in order to furnish the loan taken 3 years before. If the rate of simple interest was 5% then find the sum borrowed.
(2) Donald took a loan of $7000 at the rate of 8% simple interest per annum. If he paid an amount of $12600 to clear the loan, then find the time period of the loan.
(3) Calculate the amount due if Linda borrowed a sum of $3350 at 5% simple interest for 4 years.
(4) How much loan did Melissa borrow 5 years ago at a rate of simple interest 2% per annum, if he paid $8085 to clear it?
(5) Linda took a loan of $4700 at the rate of 10% simple interest per annum. If he paid an amount of $9400 to clear the loan, then find the time period of the loan.
(6) Lisa had to pay $4536 in order to furnish the loan taken 3 years before. If the rate of simple interest was 4% then find the sum borrowed.
(7) Find the amount to be paid if David borrowed a sum of $5400 at 7% simple interest for 8 years.
(8) Find the amount to be paid if William borrowed a sum of $5500 at 5% simple interest for 8 years.
(9) James took a loan of $4000 at the rate of 8% simple interest per annum. If he paid an amount of $6240 to clear the loan, then find the time period of the loan.
(10) Ashley had to pay $4823 in order to furnish the loan taken 3 years before. If the rate of simple interest was 2% then find the sum borrowed.