Question

If a man purchases 11 oranges for Rs. 10 and sells 10 oranges for Rs. 11. How much profit or loss does he make? 

Answer 1

Cp of one orange = ₹10/11
Sp of one orange = ₹11/10
Profit made = (11/10)-(10/11)
=(121-100)/110
21/110
He made a profit of ₹21/110 per orange.
on 11 oranges = (21/110)×11
=21/10
he made a total profit of ₹21/10