A company blends two varieties of tea from two different tea gardens, one variety costing Tk. 30 per kg and the other Tk. 20 per kg in the ratio 4 : 3. He sells the blended tea at Tk. 27 per kg. Find the profit or loss percent.

Question: A company blends two varieties of tea from two different tea gardens, one variety costing Tk. 30 per kg and the other Tk. 20 per kg in the ratio 4 : 3. He sells the blended tea at Tk. 27 per kg. Find the profit or loss percent.

Solution:
Let 4 kg of the first variety be mixed with 3 kg of second variety.
Then total cost price of 7 kg of tea = (30 × 4) + (20 × 3) = Tk. 180
Selling price of 7 kg of tea = (27 × 7) = Tk. 189

∴ Profit = Tk. (189 - 180) = Tk. 9

∴ Percentage of profit = (9 × 100)/180 = 5%