Question:
Linda took a loan of $4700 at the rate of 10% simple interest per annum. If he paid an amount of $8930 to clear the loan, then find the time period of the loan.
Correct Answer
9
Solution And Explanation
Solution
Given,
Principal (P) = $4700
Rate of Simple Interest (R) = 10% per annum
Amount (A) = $8930
Thus, time (T) = ?
Method (1) Using Formula
Calculation of Simple Interest, when Principal and Amount are givenFormual to Calculate Simple Interest when Principal and Amount are given
We know that, Amount (A) = Principal (P) + Simple Interest (SI)
⇒ Simple Interest (SI) = Amount – Principal
⇒ SI = $8930 – $4700 = $4230
Thus, Simple Interest = $4230
Calculation of the Time using forumula when Amount, Simple Interest and Principal are known
Formula to find the Time (T)
Time (T) = 100 × Simple Interest/Principal × Rate of Interest
⇒ T = 100 × SI/P × R
Thus, Time (T) = 100 × 4230/4700 × 10
= 423000/47000
= 9 years (using formula)
Thus, Time (T) = 9 years (from time taken before calculation)Answer
Calculation of the Time using Unitary Method when Amount, Simple Interest and Principal are known
Here, we have
Principal (P) = $4700
Rate of Simple Interest (R) = 10% per annum
Simple Interest = $4230 (As calculated above by subtracting Principal from the Amount given)
We know that, interest is calculated on the basis of the Principal.
This means Simple Interest for 1 year = Rate of simple interest × Principal
Thus, Simple Interest for 1 year = 10% of Principal
= 10% of $4700
= 10/100 × 4700
= 10 × 4700/100
= 47000/100 = 470
Thus, simple Interest for 1 year = $470
Now,
∵ If the simple Interest is $470, then the time = 1 year
∴ If the simple Interest is $1, then the time = 1/470 years
∴ If the simple Interest is $4230, then the time = 1/470 × 4230 years
= 1 × 4230/470 years
= 4230/470 = 9 years
Thus, time (T) = 9 years Answer
Similar Questions
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(2) Find the amount to be paid if Thomas borrowed a sum of $5800 at 5% simple interest for 8 years.
(3) Calculate the amount due if Barbara borrowed a sum of $3550 at 5% simple interest for 3 years.
(4) Calculate the amount due if Jessica borrowed a sum of $3750 at 2% simple interest for 4 years.
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(6) Find the amount to be paid if Barbara borrowed a sum of $5550 at 9% simple interest for 7 years.
(7) Find the amount to be paid if Jennifer borrowed a sum of $5250 at 6% simple interest for 8 years.
(8) Calculate the amount due if Sarah borrowed a sum of $3850 at 9% simple interest for 3 years.
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