Question:
What amount will be due after 2 years if Joshua borrowed a sum of $3950 at a 6% simple interest?
Correct Answer
$4424
Solution And Explanation
Solution
Given,
Principal (P) = $3950
Rate of Simple Interest (SI) = 6%
Time (t) = 2 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) = $3950 × 6% × 2
= $3950 ×6/100 × 2
= 3950 × 6 × 2/100
= 23700 × 2/100
= 47400/100
= $474
Thus, Simple Interest = $474
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 = $3950 + $474
= $4424
Thus, Amount to be paid = $4424 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 = $3950
Rate of Simple Interest (SI) or (R) = 6%
And, Time (t) = 2 years
Thus, Amount (A)
= $3950 + ($3950 × 6% × 2)
= $3950 + ($3950 ×6/100 × 2)
= $3950 + (3950 × 6 × 2/100)
= $3950 + (23700 × 2/100)
= $3950 + (47400/100)
= $3950 + $474 = $4424
Thus, Amount (A) to be paid = $4424 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 $3950, the simple interest in 1 year
= 6/100 × 3950
= 6 × 3950/100
= 23700/100 = $237
Thus, simple interest for 1 year = $237
Therefore, simple interest for 2 years
= Simple interest for 1 year × 2
= $237 × 2 = $474
Thus, Simple Interest (SI) = $474
Calculation of Amount
Amount = Principal + Interest
Thus, Amount = $3950 + $474
= $4424
Thus, Amount to be paid = $4424 Answer
Similar Questions
(1) Calculate the amount due if Charles borrowed a sum of $3900 at 5% simple interest for 4 years.
(2) In how much time a principal of $3150 will amount to $3528 at a simple interest of 4% per annum?
(3) Find the amount to be paid if Christopher borrowed a sum of $6000 at 8% simple interest for 8 years.
(4) If Thomas borrowed $3800 from a bank at a rate of 2% simple interest per annum then find the amount to be paid after 2 years.
(5) Anthony took a loan of $6600 at the rate of 7% simple interest per annum. If he paid an amount of $9372 to clear the loan, then find the time period of the loan.
(6) Betty took a loan of $6500 at the rate of 8% simple interest per annum. If he paid an amount of $10660 to clear the loan, then find the time period of the loan.
(7) What amount does Jessica have to pay after 5 years if he takes a loan of $3750 at 4% simple interest?
(8) David took a loan of $4800 at the rate of 9% simple interest per annum. If he paid an amount of $8256 to clear the loan, then find the time period of the loan.
(9) Donald took a loan of $7000 at the rate of 7% simple interest per annum. If he paid an amount of $10920 to clear the loan, then find the time period of the loan.
(10) Calculate the amount due after 10 years if David borrowed a sum of $5400 at a rate of 2% simple interest.