In calculating profit percent and loss percent we will learn about the basic concepts of profit and loss. We will recall facts and formula while calculating profit percent and loss percent. Now we will apply the concept of percentage to find profit/loss in selling and buying of goods in our day to day life.

**Cost price (CP)** The amount for which an article is bought is called its cost price.

**Selling price (SP) ** The amount for which an article is sold is called its selling price.

**Profit or gain** When (SP) > (CP) then there is a gain.

Gain = (SP) - (CP)

** Loss ** When (SP) < (CP) then there is a loss.

Loss = (CP) - (SP).

**Notes: **

The gain or loss is always reckoned on the cost price

Calculating Profit Percent and Loss Percent

I. Gain = (SP) - (CP)

II. Loss = (CP) - (SP)

III. Gain% = (gain / CP × 100)%

IV. Loss % = (loss/ CP × 100)%

V. **To find SP when CP and gain% or loss% are given:**

● SP = [(100 + gain %) / 100] × CP

● SP = {(100 - loss %) /100} × CP

VI. **To find CP when SP and gain% or loss% are given: **

● CP = {100/(100 + gain %)} × SP

● CP = {100 /(100 - loss %)} × SP

Calculating Profit Percent and Loss Percent

**1.** Mike bought a DVD for $ 750 and sold it for $ 875. Find Mike's gain per cent. **Solution:**

CP = $ 750 and SP = $ 875.

Since (SP) > (CP), Mike makes a gain.

Gain = $ (875 - 750)

= $ 125.

Gain% = {(gain/CP) × 100} %

= {(125/750) × 100} %

= (50/3) %

= 16 (2/3) %

**2.** Ron purchased a table for $ 1260 and due to some scratches on its top he had to sell it for $ 1197. Find his loss per cent. **Solution:**

CP Rs.1260 and SP = $ 1197.

Since (SP) < (CP), Ron makes a loss.

Loss = $ (1260 - 1197)

= $ 63.

Loss % = [(loss / CP) × 100] %

= [(63 / 1260) × 100] %

= 5%

In calculating profit percent and loss percent, sometimes after purchasing an article, we have to pay some more money for things like transportation, repairing charges, local taxes, These extra expenses are called **overheads**.

For calculating the total cost price, we add overheads to the purchase price.

**3.** Maddy purchased an old scooter for $ 12000 and spent $ 2850 on its overhauling. Then, he sold it to his friend Sam for $ 13860. How much per cent did he gain or lose? **Solution:**

Cost price of the scooter = $ 12000, overheads = $ 2850.

Total cost price = $ (12000 + 2850) = $ 14850.

Selling price = $ 13860.

Since (SP) < (CP), Maddy makes a loss.

Loss = $ (14850 - 13860) = $ 990.

Loss = [(loss / total CP) × 100] %

= [(990 / 14850) × 100] %

= 6

**4.** Ron ought an almirah for $ 6250 and spent $ 375 on its repairs. Then, he sold it for $ 6890. Find his gain or loss per cent.

**Solution:**

CP of the almirah = $ 6250,

Overheads = $ 375.

Total cost price = $ (6250 + 375)

= $ 6625.

Selling price = $ 6890.

Since, (SP) > (CP), Ron gains.

Gain% = $ (6890 - 6625)

= $ 265.

Gain% = [(gain / total CP) × 100] %

= [(265 / 6625) × 100] %

= 4 %

**5.** A vendor bought oranges at 20 for $ 56 and sold them at $ 35 per dozen. Find his gain or loss per cent.

**Solution:**

LCM of 20 and 12 = (4 × 5 × 3) = 60.

Let the number of oranges bought be 60.

CP of 20 oranges = $ 56

CP of 1 orange = $ (56 / 20)

CP of 60 oranges = $ [(56 / 20) × 60] = $ 168

SP of 12 oranges = $ 35

SP of 1 orange = $ [(35 / 12) × 60] = $ 175

Therefore, CP = $ 168 and SP = $ 175.

Since, (SP) > (CP), the vendor gains.

Gain = $ (175 - 168) = $ 7.

Gain % = [(gain / CP) × 100] %

= [(7 / 168) × 100] %

= 25 / 6 %

= 4 ¹/₆ %

**6.** If the cost price of 10 pens is equal to the selling price of 8 pens, find the gain or loss per cent.

**Solution:**

Let the cost price of each card be $ x

Then, CP of 8 pens = $ 8x.

SP of 8 pens = CP of 10 pens = $ 10x.

Thus, CP = $ 8x and SP = $ 10x.

Since, (SP) > (CP), there is a gain.

Gain = $ (10x - 8x) = $ 2x.

Gain % = [(gain / CP) × 100] %

= [(2x / 8x) × 100] %

= 25%

● **Profit, Loss and Discount**

**Calculating Profit Percent and Loss Percent**

**Word Problems on Profit and Loss**

**Examples on Calculating Profit or Loss**

**Practice Test on Profit and Loss**

**Practice Test on Profit Loss and Discount**

● **Profit, Loss and Discount - Worksheets**

**Worksheet to Find Profit and Loss**

**Worksheets on Profit and Loss Percentage**

**Worksheet on Gain and Loss Percentage**

**8th Grade Math Practice**** ****From Calculating Profit Percent and Loss Percent to HOME PAGE**

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