The conversation between human and AI assistant.
A man sold a bat,whose MP is 30₹, at a discount of 15% and gave a ball costing 1.50₹ free with bat & made profit of 20%. His cost of bat is?
What's next?
Finally, we need to use the fact that the man made a profit of 20% on the sale. We know that the profit percentage is calculated as (profit/cost) x 100. In this case, the profit is the difference between the selling price and the total cost of the bat and ball, which is 25.50₹ - (x + 1.50₹). So:

(20/100) = (25.50₹ - (x + 1.50₹) - x)/(x + 1.50₹)

Simplifying this equation, we get:

x = 15₹

Therefore, the cost of the bat is 15₹.