A dealer makes a profit equal to the selling price of 4 pens when he sells a total of 12 pens. What is his profit percentage?

Correct option is C

Given:
Profit on selling 12 pens = Selling Price of 4 pens
Formula Used:
Profit = Selling Price - Cost Price
Profit Percentage = $$\frac{Profit}{Cost\ Price}$$​ × 100
Solution:
Let the Selling Price (SP) of 1 pen be 1 unit.
Then, the SP of 12 pens = 12 units.
Profit = SP of 4 pens = 4 units.
Calculate the Cost Price (CP) of 12 pens:
CP = SP - Profit
CP = 12 - 4 = 8 units
Calculate the Profit Percentage:
Profit Percentage = $$\frac{4}{8}$$​ × 100 = $$\frac{1}{2}$$​ × 100 = 50
The profit percentage is 50%.
Final Answer
So the correct answer is (c)