If the cost price is 25% of selling price. Then what is the profit percent.

Answer: Option B

Explanation:

Let the cost price = Rs 100
then, Marked price = Rs 135

Required gain = 8%,
So Selling price = Rs 108
Discount = 135 - 108 = 27

Discount% = (27/135)*100 = 20%

Answer: Option D

Explanation:

In this type of question, we will first find total C.P. of items, then total S.P. of items, then we will get gain or loss. From which we can easily calculate its percentage.

So lets solve it now.
$$\begin{aligned} \text{So, C.P. of 1st transistor = }\\ \left( \frac{100}{120} * 840 \right) = 700 \\ \text{C.P. of 2nd transistor = }\\ \left( \frac{100}{96} * 960 \right) = 1000 \\ \text{Total C.P. = 1700 }\\ \text{Total S.P. = 1800 }\\ \text{Gain = 1800 - 1700 = 100}\\ \text{Gain% = } \left( \frac{100}{1700} * 100 \right) \\ = 5\frac{15}{17}\% \end{aligned}$$

Answer: Option A

Explanation:

Please note in this type of questions, get the value of 1 kg to solve this question, lets solve it.

C.P. of 1 Kg = 420/70 = Rs. 6
Selling Price = 6.50
Gain = Rs. 0.50

$$\begin{aligned} Gain\% = \frac{.50}{6}*100 \\ = 8\frac{1}{3}\% \end{aligned}$$

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 C

Explanation:

We need to get the Total selling price to solve this question. Because after getting selling price we can get profit or loss, then we can calculate profit% or loss%

So lets solve this:

Price Received by selling one fourth of the material at a loss of 20% =
(1/4) * 600 * (80/100) = Rs. 120

Price Received by remaining material at a gain of 10% =
(3/4) * 600 * (110/100) = Rs. 495 [Note: 1-(1/4) = 3/4]

Total Selling Price = 120 + 465 = Rs. 615

Profit = 615 - 600 = 15

$$\begin{aligned} Profit\% = \left( \frac{Gain}{Cost} * 100 \right)\% \\ = \left( \frac{15}{600} * 100 \right)\% \\ = \frac{5}{2}\% = 2\frac{1}{2}\% \end{aligned}$$