A trader mixes 26 kg of fertilizer at Tk. 20 per kg with 30 kg of fertilizer of other variety at Tk. 36 per kg and sells the mixture at Tk. 30 per kg. His profit percent is:

Question: A trader mixes 26 kg of fertilizer at Tk. 20 per kg with 30 kg of fertilizer of other variety at Tk. 36 per kg and sells the mixture at Tk. 30 per kg. His profit percent is:

Solution:
Cost price of 56 kg fertilizer = Tk. (26 × 20) + (30 × 36)
= Tk. (520 + 1080)
= Tk. 1600

∴ Selling price of 56 kg rice = Tk. (56 × 30)
= Tk.1680

Profit = Tk. (1680 - 1600) = Tk. 80
∴ Gain = {(80/1600) × 100}
= 5%