A pharmaceutical company made 3000 strips of tablets at a cost of Rs. 4800. The company gave away 1000 strips of tablets to doctors as free samples. A discount of 25% was allowed on printed price. Find ratio profit if price is raised from Rs. 3.25 to Rs. 4.25 per strip and if at latter price, samples to doctors were done away with. (New profit / Old profit).

Total sales revenue (Old) = 2000 × 3.25 × 0.75 = 4875 [0.75 as 25% discount was allowed]
Profit_old = Total sales revenue - 4800
= 4875 - 4800 = 75
Total sales revenue (New) = 3000 × 4.25 × 0.75 = 9562.5 [New price is calculated on doctors samples as well.]
Profit_new = 9562.5 - 4800 = 4762.5
Ratio,
$$\frac{{{\text{Profi}}{{\text{t}}_{{\text{new}}}}}}{{{\text{Profi}}{{\text{t}}_{{\text{old}}}}}} = \frac{{4762.5}}{{75}} = 63.5$$