retagged by
1,584 views

2 Answers

Best answer
2 votes
2 votes

Option A. 625

Let the sum be Rs. x. Then,

C.I. = x$\left ( 1 + \frac{4}{100} \right )^{2}$ – x = $\frac{51}{625}$x

S.I. = $\frac{x * 4 * 2}{100}$ = $\frac{2}{25}$x

$\therefore \frac{51x}{625} - \frac{2x}{25} = 1$

$\Rightarrow$ x = 625

selected by
0 votes
0 votes

Answer is A

If the difference between compound and simple interest is of two years then, direct formula can be applied.

$Difference =Principal(1+\frac{Rate}{100})^{2}$

Rs.1 $=P*(\frac{4}{100})^{2}$

P = Rs.625 

 

Difference between simple and compound interests is of 3 years = $3P(\frac{R}{100})^{2}+P(\frac{R}{100})^{3}$

Above formulae can be used only if the difference between CI and SI are 2 years and 3 years.

edited by
Answer:

Related questions

0 votes
0 votes
1 answer
2
Lakshman Bhaiya asked Mar 30, 2020
1,651 views
What is the maximum number of the handshakes that can happen in the room with $5$ people in it?$15$$10$$6$$5$
1 votes
1 votes
2 answers
3
Lakshman Bhaiya asked Mar 30, 2020
1,150 views
A train running at the speed of $60$ km/hr crosses a pole in $9$ seconds. What is the length of the train?$120$ meters$180$ meters$324$ meters$150$ meters
1 votes
1 votes
2 answers
4
0 votes
0 votes
1 answer
5
Lakshman Bhaiya asked Mar 30, 2020
884 views
A boatman goes $2$ km against the current of the stream in $1$ hour and goes $1$ km along the current in $10$ minutes. How long will it take to go $5$ km in stationary wa...