Question

A certain sum of money amounts to 756 rupees in 2 years and to 873 rupees in 3 and a half year at a certain rate of simple interest. What is the rate of interest per annum ?Please don't give incorrect answer I beg you please.​

Answer 1

Answer:

Step-by-steIt is given that Principle + Simple Interest for 3.5 years = 873 Rs-----(1)

Principle + Simple Interest for 2 years = 756 Rs -------(2)

Subtracting (1) – (2) we get

Simple Interest for 1.5 years = 117 Rs.

Therefore, S.I = P x R xT .

Simple Interest for 2 years = Rs. 117/1.5 x2 =156 Rs.

Therefore P = 756 - 156 = 600 Rs

And rate of interest =100 x 156/600 x2 = 13% per annum.

p explanation:

Answer 2

Answer:

$\huge\underline\bold {Answer:}$

Let the initial cost price of the article be 100 rupees.

Profit = 20%

S.P. of the 1st dealer

$= \frac{100 \times 120 }{100} = 120 \: rupees$

Let the second profit % = x. Then,

S.P. of the 2nd dealer

$= \frac{120 \times (100 + x)}{100}$

Final S.P. of the article after passing through two hands at a profit = 38%

$= \frac{100 \times (100 + 38}{100} = 138$

Given,

$\frac{120 \times (100 + 38)}{100} = 138$

$= > 12000 + 120x = 13800$

$= > 120x = 1800 \\ = > x = 15\%$

So, if the dealer makes a profit of 20%, then the profit per cent made by the second is 15%.