Question

what profit,lost and discount

Answer 1

profit means  if we buy a thing in 10 rs and sell in 15 rs then we had a profit of rs 5
 formula SP-CP= profit
loss means if we buy a thing in 10 rs and sell in 5 rs then we had a loss of rs 5
     formula CP-SP=loss
discount means if we buy a thing in 10 rs and sell in 5 rs then we gave the profit of rs 5 to the buyer

Answer 2

*Profit means gain in selling price above cost price.
profit = selling price - cost price
 *Loss means decrease in selling price below cost price
loss = cost price - selling price
* Discount means reduction in the selling price by certain percentage.