Question

a sum when reckoned at 7 whole1/2 % per annum amounts to ₹3920 in 3years. find the sum.


Plz give me the right answer with the solution
I will give him brainliest answer ​

Answer 1

Answer:

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The rate of Interest is 7.5% therefore in 3 years the interest earned would be 2.5*3 = 22.5%. This is the interest portion and there's a principal (sum), which is originally 100%, thus the amount becomes 122.5%. Now this 122.5% is equal to 3920, therefore, 100% is equal to (3920/122.5)*100. This is nothing but 3200.

Step-by-step explanation:

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Answer 2

Answer:

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

Step-by-step explanation:

The rate of Interest is 7.5% therefore in 3 years the interest earned would be 2.5*3 =22.5%.This is the interest portion and there's a principal (sum), which is originally 100%, thus the amount becomes 122.5%. Now this 122.5% is equal to 3920, therefore, 100% is equal to (3920/122.5)*100. This is nothing but 3200.