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 C

Explanation:

Let the new S.P. be x, then.
(100 - loss%):(1st S.P.) = (100 + gain%):(2nd S.P.)

$$\begin{aligned} =>\left( \frac{95}{1140} = \frac{105}{x} \right) \\ => x = 1260 \end{aligned}$$

Answer: Option B

Explanation:

Question seems a bit tricky, but it is very simple.
Just calculate all Cost price, then get 150% of CP.

C.P. = 10000 + 5000 + 1000 = 16000

150% of 16000 = 150/100 * 16000 = 24000

Answer: Option D

Explanation:

So we have C.P. = 27.50
S.P. = 28.60

Gain = 28.60 - 27.50 = Rs. 1.10

$$\begin{aligned} Gain\% = \left( \frac{Gain}{Cost} * 100 \right)\% \\ = \left( \frac{1.10}{27.50} * 100 \right)\% = 4\% \end{aligned}$$

Answer: Option D

Explanation:

Hint: Calculate profit percent as

Profit% = (profit/cost) * 100

Answer: Option D

Explanation:

Let the Cost Price of one article = Rs. 1
CP of x articles = Rs. x
CP of 20 articles = 20
Selling price of x articles = 20

Profit = 25% [Given]

$$\begin{aligned} \Rightarrow \left (\dfrac{SP - CP }{CP}\right ) = \dfrac{25}{100} = \dfrac{1}{4} & \Rightarrow \dfrac{\left(20-x \right )}{x} = \dfrac{1}{4} \\ & \Rightarrow 80 - 4x = x \\ & \Rightarrow 5x = 80 \nonumber \\ & \Rightarrow x = \dfrac{80}{5} = 16 \\ \end{aligned}$$