A sum when reckoned at 7-1/2% per annum amounts to 3920 in 3 years. Find the sum.
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Step-by-step explanation:
A sum when reckoned at 7.5% per annum amounts to 3920 in 3 years. Find the sum?
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7 Answers

Parijat Tiwari, studied at Shree Ganpati Institute of Technology
Answered January 7, 2019
It's a question of sequence….a question of definite cycle…
All I mean to say is, let's say
I have 100 rupees in my wallet and I lent it to one of my friend at 7.5% for 3 years.
After 3 years when he becomes a rich man, he returns a total sum of 122.5 rupees.
For a better understanding, we can say the above as:
100 rupees ( Principal) + 22.5 rupees (7.5 X 3 years)
= 122.5 rupees
But here as the problem states that after 3 years the amount is 3920 rupees.
So 122.5 unit = 3920 rupees
So 1 in unit = (3920/122.5)
1 unit = 32 rupees
So 100 unit ( which a lent initially to my friend) is equal to
= 100 X 32 = 3200 rupees
I can also post a picture of the solution if the story method seems to be too boring to you.
Thanks
KESHAV parijat
2.3K views

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Aditya Jain
Answered November 8, 2018
We are given
Amount (A) = 3920
Rate (R) = 7.5%
Time (T) = 3 years
The formula for simple interest (S.I.) is
(P*R*T)/100
A = S.I. + P
3920 = {(P*R*T)/100} + P
3920 = {(P*7.5*3)/100} + P
3920 = {(P*22.5)/100} + P
Here we will take L.C.M of 100 and 1
3920 = (22.5P + 100P)/100
3920*100 = 122.5P
392000/122.5 = P
P = 3200
Hence, the sum is 3200.
Step-by-step explanation:
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