**Cost Price**– the price at which an article is purchased is called its cost price(CP)**Selling Price**– the price at which an article is sold is called its selling price (SP)**Profit or Gain**– if SP is greater than CP, the seller is said to have a profit.

**Loss-** if SP is less than CP the seller is said to have is called a loss.

Calculation

If an article is sold at a gain of say then

If an article is sold at a loss of say than

When a person sells two similar items one at a gain of say x% & the other at a loss of x% then the seller always increases the loss given by

If a trader professes to sell his goods at cost price but uses false weight than

**Example**

If pure ghee costs Rs 100/kg after adulterating it with vegetable oil casting Rs 50/kg a profit of 20% in what ratio does he mix the two?

Required ratio- 30:20

Oil: ghee

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