In a certain store, the profit is 320% of the cost. If the cost increases by 25% but the selling price remains constant, approximately what percentage of the selling price is the profit

Answer: Option A

Explanation:

Let C.P.= Rs. 100.
Then, Profit = Rs. 320,
S.P. = Rs. 420.

New C.P. = 125% of Rs. 100 = Rs. 125
New S.P. = Rs. 420.

Profit = Rs. (420 - 125) = Rs. 295

Required percentage = (295/420) * 100
= 70%(approx)

Answer: Option B

Explanation:

$$\begin{aligned} Gain\% = \\ \left( \frac{(100 + \text{common gain}\%)^2}{100} - 100 \right)\% \\ = \left( \frac{(100 + 10)^2}{100} - 100 \right)\% \\ = \left( \frac{12100 - 10000}{100}\right)\% \\ = 21\% \end{aligned}$$

Answer: Option B

Explanation:

We Know,

$$\begin{aligned} S.P. = \left( \frac{100+gain\%}{100} * C.P \right)\\ => C.P. = \frac{100}{122.50}* 392 \\ = 320 \\ Profit = 392 -320 = Rs 72 \end{aligned}$$

Answer: Option D

Explanation:

Hint: Calculate profit percent as

Profit% = (profit/cost) * 100

Answer: Option A

Explanation:

This type of question can be easily and quickly solved as following:

Let at Rs x it can earn 15% pr0fit
85:18700 = 115:x [as, loss = 100 -15, Profit = 100 +15]

x = (18700*115)/85
= Rs.25300