Bipin offers a discount scheme that on buying 7 notebooks, get 3 for free. What will be the sale price (in Rs.) of a notebook with a marked price Rs. 185, if the equivalent percentage discount is applied?

Correct option is A

Given:
Buy 7, get 3 free
=> pay for 7 but receive 10 notebooks
Marked price = 185.
Formula Used:
 selling price per notebook = MP × (1 − discount).
Solution:
Effective discount = $$\frac{\text{free}}{\text{total}} = \frac{3}{10} = 30\%$$​​
Discount = 30%
Selling price per notebook = 185 × 0.70 = 129.50
So sale price = Rs. 129.50.  
Exam Hall Method: