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**1.**If the cost price is lesser than the selling price, then there is a profit.

\(\text{Profit}\) \(=\) \(\text{S.P.}\) \(-\) \(\text{C.P.}\)

**2.**If the selling price is lesser than the cost price, then there is a loss.

\(\text{Loss}\) \(=\) \(\text{C.P.}\) \(-\) \(\text{S.P.}\)

**3.**If the cost price equals the selling price, then there is neither profit nor loss.

\(\text{C.P.}\) \(=\) \(\text{S.P.}\) (Neither profit nor loss)

**4.**\(\text{Discount}\) \(=\) \(\text{M.P.}\) \(-\) \(\text{S.P.}\) (or) \(\text{S.P.}\) \(=\) \(\text{M.P.}\) \(-\) \(\text{Discount}\)

**5.**If there is no discount, then \(\text{M.P.}\) \(=\) \(\text{S.P.}\)

Example:

**1.**If C.P.

**\(= Rs.1200\)**, S.P.

**\(= Rs.1500\)**, find profit or loss.

In this case, S.P. \(>\) C.P.

\(\text{Profit}\) \(=\) \(\text{S.P.}\) \(-\) \(\text{C.P.}\)

\(=\) \(1500\) \(-\) \(1200\) \(= Rs.300\)

Profit \(= Rs.300\)

**2.**If C.P.

**\(= Rs.2000\)**, S.P.

**\(= Rs.1000\)**, find profit or loss.

In this case, C.P. \(>\) S.P.

\(\text{Loss}\) \(=\) \(\text{C.P.}\) \(-\) \(\text{S.P.}\)

\(2000 - 1000\) \(=\) \(Rs.\)\(1000\)

Loss \(=\) \(Rs.\)\(1000\)

**3.**If C.P.

**\(= Rs.2200\)**, S.P.

**\(= Rs.2200\)**, find profit or loss.

In this case, \(\text{C.P.}\) \(=\) \(\text{S.P.}\)

Therefore, there is neither profit nor loss.

**4.**If the M.P.

**\(= Rs.10000\)**, S.P.

**\(= Rs.9000\)**, find discount.

\(\text{Discount}\) \(=\) \(\text{M.P.}\) \(-\) \(\text{S.P.}\)

\(= 10000 - 9000\)

\(= Rs.1000\)

**5.**If M.P.

**\(=\) \(Rs.1550\)**, Discount

**\(= Rs.250\)**, find S.P.

\(\text{S.P.}\) \(=\) \(\text{M.P.}\) \(-\) \(\text{Discount}\)

\(= 1550 - 250\)

\(= Rs.1300\)

**6.**If M.P.

**\(= Rs.200\)**, S.P.

**\(= Rs.200\)**, find discount.

In this case, \(\text{M.P.}\) \(=\) \(\text{S.P.}\)

So, there is no discount.