6th Grade Math Textbook, Fundamentals

Lesson 7-8 for exercise sets. &KDSWHU 

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Find the percent increase. If necessary, round to the nearest tenth of a percent.

1.from 12 to 15 2.from 0.3 to 0.66 3.from 40 to 45

Find the profit to the nearest cent.

4.Cost: $48.60 5.Cost: $124 6.Cost: $92.50

Percent profit: 25% Percent profit: 6.25% Percent profit: 9.2%

7.An antique car dealer made a profit of 18% on a car that cost $40,000.

For how much did he sell the car?

8.Discuss and Write Explain how you find the selling price of an item when

you know the original price and the percent profit.

To find the amount of profit, multiply the original cost by the percent profit.

• The of an item is the original amount spent for it.


• is the money gained when an item is sold above the cost.
  A company buys microwave ovens for $200 each and then sells each at a gain of 15%.
  What is the company’s profit from buying and selling each microwave oven?

Profit

cost

Method 1 Write an Equation

Let Pthe amount of profit.

P 15% • $200

P 0.15• $200

P $30.00

So the profit per microwave oven is $30.

Write 15% as a decimal,

then multiply.

Multiply the original cost

by the percent of profit.

Method 2 Write and Solve a Proportion





100 P 200 • 15 Cross multiply.

 Divide both sides by 100.

P 30

3000

100

100 P

100

Substitute $200 for

the cost and 15 for

the percent profit.

15

100

P

200

percent profit (%)

100

profit (P)

original cost

The of an item is the amount

for which the item is sold. When an item is sold

at a profit, the selling price is morethan the cost.

Add the profit to the cost to find the selling price.

A video dealer imports large flat screen TVs for $1200 each. The dealer

then sells each TV at a profit of 30%. Find the selling price per unit.

SP$1200 (30% of $1200) The cost is $1200, and the profit is 30% of $1200.

SP$1200 (0.30• $1200) Write 30% as the decimal 0.30, then multiply 1200 by 0.30.

SP$1200 $360 The profit is $360, so add $360 to the cost, $1200.

SP$1560

So the selling price for each flat screen TV is $1560.

selling price (SP)

cost profit

0% 100% 30%