Question

answer me with explanation plz

Answer 1

Hey friend, Harish here.

Here is your answer:

Given that,

1) Amount = Rs 720

2) Time = 2 years 6 months = 2.5 years.

3) Rate of Interest = 5%.

To find,

The principle amount.

Solution:

We know that,

$Amount = (Principle) + S.I$

Let principle amount be ' P '

Then,

$S.I = \frac{P\times R \times T }{100}$

⇒  $\frac{P\times 5\times 2.5}{100} = 0.125 P$

Then, 

$Amount = P + 0.125P$

⇒ $720 = 1.125P$

⇒ $P = \frac{720}{1.125} = Rs. \ 640$

Therefore principle amount is Rs 640. (OPTION - B)
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Hope my answer is helpful to you.