Correct Answer - Option 2 : 50%
Given:
Notebooks sold = 12
Profit = Selling price of 4 notebooks
Formula Used:
Selling price = Cost price + Profit
Profit% = \(\frac{Profit}{Cost\space Price} × 100\)
Calculation:
Let assume that the selling price of 1 notebook is 'SP'
And cost price of 1 notebook is 'CP'
The selling price of 12 notebooks = 12 SP
The cost price of 12 notebooks = 12 CP
According to the question:
Profit = Selling Price - Cost Price
⇒ 4 SP = 12 SP - 12 CP
⇒ CP/SP = 2/3
CP = 2 units
SP = 3 units
Profit = 1 unit
Now,
⇒ Profit% = 1/2 × 100
⇒ Profit% = 50%
∴ Profit% is 50%
The correct option is 2 i.e. 50%