Formula to Find Cost Price
Finding the cost price when the profit or loss percentage and selling price are given involves a simple mathematical formula.

For Profit:
1. Let's assume the cost price is x, the profit percentage is y%, and the selling price is z.
2. The formula to find the cost price in case of profit is:
Cost Price = Selling Price / (1 + (Profit Percentage / 100))

For Loss:
1. Let's assume the cost price is x, the loss percentage is y%, and the selling price is z.
2. The formula to find the cost price in case of loss is:
Cost Price = Selling Price / (1 - (Loss Percentage / 100))

Explanation:
- In case of profit, the cost price is calculated by dividing the selling price by (1 + (profit percentage / 100)). This formula takes into account the profit percentage and the selling price to determine the cost price.
- In case of loss, the cost price is calculated by dividing the selling price by (1 - (loss percentage / 100)). This formula considers the loss percentage and the selling price to calculate the cost price.
By using these formulas, you can easily find the cost price when the profit or loss percentage and selling price are known.

c.p=s.p/1+(profit%/100)c.p=s.p/1-(loss%/100)