We will learn how to calculate loss and loss percent.

If selling price is less than the cost price (S.P. < C.P.), there is a loss.

Loss = cost price - selling price

or, cost price = loss + selling price

Selling price = cost price - loss

Loss% → loss on $100 is called loss%

Loss percent is always calculated on cost price

So, loss% = loss/cost price × 100

Solved examples:

**1.** A dress was
bought for $400 and sold $350. Find the loss and loss percent.

**Solution: **

Cost price = $400

Selling price = $350

Since, S. P. < C. P., there is loss

Therefore, loss = cost price - selling price

= $450 - $350

= $50

So, loss% = loss/cost price × 100%

= 50/400 × 100%

= 25/2

= 12.5%

**2.** If the cost
price of 20 electric goods is equal to the selling price of 25 electric goods,
find loss per cent.

**Solution: **

Let cost price of 1 electric good = $1

Then cost price of 20 electric goods = $20

Also, cost price of 25 electric goods = $25

Since, selling price of 25 electric goods = cost price of 20 electric goods

Therefore, selling price of 25 electric goods = $20

Therefore, loss = cost price - selling price

= $25 - $20

= $5

Therefore, loss% = loss/cost price × 100

= 5/25 × 100

= 20%

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