A multinational medicine company gives one dozen bottles of cough syrup for free and 25% discount on order of 12 dozen bottles, as an offer…

Marked price of one bottle = Rs. 140

After 25% discount = 140 × 75/100 = Rs. 105

∴ Cost price of 12 dozen bottles = 12 × 12 × 105 = Rs. 15120

According to question he gives one dozen free bottles on order of 12 dozen so he gives 13 dozen bottle.

In the no loss condition cost price should be equal to selling price.

∴ Cost price = Selling price

12 × 12 × 105 = 12 × 13 × Cost price of one bottle

Cost price of one bottle $(= {\rm{}}\frac{{15120}}{{156}}{\rm{}} = {\rm{\;Rs}}.{\rm{\;}}96.92)$ (97 approx.)