A man purchased some salt with Tk. 7 per kg and sold those salt with 7.5 per kg. He made Tk. 30 profit. How much salt did he buy?

Question: A man purchased some salt with Tk. 7 per kg and sold those salt with 7.5 per kg. He made Tk. 30 profit. How much salt did he buy?

Solution:
Given that,
Cost Price (CP) of 1 kg salt = Tk. 7
Selling price (SP) of 1 kg salt = Tk. 7.5
Profit on 1 kg salt = (7.5 - 7) Tk.
= 0.5 Tk.

According to the question,
0.5 Tk. profit is made on 1 kg salt
1 Tk. profit is made on (1/0.5) kg salt
30 Tk. profit is made on (30/0.5) kg salt
= 60 kg.

∴ The man bought 60 kg salt