Question:
Calculate the amount due if Linda borrowed a sum of $3350 at 10% simple interest for 4 years.
Correct Answer
$4690
Solution And Explanation
Solution
Given,
Principal (P) = $3350
Rate of Simple Interest (SI) = 10%
Time (t) = 4 years
Thus, Amount (A) = ?
The Rate of Interest is always calculated per annum, i.e. per year.
Thus, here 10% simple interest means, Rate of Simple Interest (SI) is 10% 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) = $3350 × 10% × 4
= $3350 ×10/100 × 4
= 3350 × 10 × 4/100
= 33500 × 4/100
= 134000/100
= $1340
Thus, Simple Interest = $1340
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 = $3350 + $1340
= $4690
Thus, Amount to be paid = $4690 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 = $3350
Rate of Simple Interest (SI) or (R) = 10%
And, Time (t) = 4 years
Thus, Amount (A)
= $3350 + ($3350 × 10% × 4)
= $3350 + ($3350 ×10/100 × 4)
= $3350 + (3350 × 10 × 4/100)
= $3350 + (33500 × 4/100)
= $3350 + (134000/100)
= $3350 + $1340 = $4690
Thus, Amount (A) to be paid = $4690 Answer
Method (3) Unitary Method
Calculation of Amount using Unitary Method
Calculation of Interest using Unitary Method
Here, given Rate of Simple Interest = 10%
This, means, $10 per $100 per year
∵ For $100, the simple interest for 1 year = $10
∴ For $1, the simple interest for 1 year = 10/100
∴ For $3350, the simple interest in 1 year
= 10/100 × 3350
= 10 × 3350/100
= 33500/100 = $335
Thus, simple interest for 1 year = $335
Therefore, simple interest for 4 years
= Simple interest for 1 year × 4
= $335 × 4 = $1340
Thus, Simple Interest (SI) = $1340
Calculation of Amount
Amount = Principal + Interest
Thus, Amount = $3350 + $1340
= $4690
Thus, Amount to be paid = $4690 Answer
Similar Questions
(1) Calculate the amount due after 9 years if Karen borrowed a sum of $5950 at a rate of 4% simple interest.
(2) Calculate the amount due after 10 years if David borrowed a sum of $5400 at a rate of 6% simple interest.
(3) What amount does Charles have to pay after 5 years if he takes a loan of $3900 at 4% simple interest?
(4) Daniel took a loan of $6200 at the rate of 8% simple interest per annum. If he paid an amount of $10664 to clear the loan, then find the time period of the loan.
(5) Mark had to pay $4928 in order to furnish the loan taken 3 years before. If the rate of simple interest was 4% then find the sum borrowed.
(6) What amount does Charles have to pay after 6 years if he takes a loan of $3900 at 5% simple interest?
(7) Charles took a loan of $5800 at the rate of 8% simple interest per annum. If he paid an amount of $9512 to clear the loan, then find the time period of the loan.
(8) Find the amount to be paid if Richard borrowed a sum of $5600 at 6% simple interest for 8 years.
(9) Calculate the amount due if Patricia borrowed a sum of $3150 at 4% simple interest for 3 years.
(10) Find the amount to be paid if Jennifer borrowed a sum of $5250 at 4% simple interest for 8 years.