04/13/2010 Proportion and Percent #23

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04/13/2010 Proportion and Percent #23. Warm Up : Answer as many as possible without looking at your notes. Then use your notes to finish. LT: I will apply my understanding of ratios to solve problems involving proportional relationships, including percent. Today’s Plan: -Warm-Up

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04/13/2010 Proportion and Percent #23

Warm Up: Answer as many as possible without looking at your notes. Then use your notes to finish.

LT: I will apply my understanding of ratios to solve problems involving proportional relationships, including percent.

Today’s Plan:

-Warm-Up

-Percent Increase and Decrease

-Assignment

04/13/2010 Proportion and Percent #23

White boards

LT: I will apply my understanding of ratios to solve problems involving proportional relationships, including percent.

Today’s Plan:

-Warm-Up

-Percent Increase and Decrease

-Assignment

Multi-Step Percent Problems

A. Sarah bought a DVD player originally priced at \$450 that was on sale for 20% off. What was the sale price?

\$450 20% First find 20% of \$450.

\$450 0.20 = \$90 20% = 0.20

The amount of decrease is \$90.

Think: The reduced price is \$90 less than \$450.

\$450 – \$90 = \$360Subtract the amount of decrease.

The sale price of the DVD player was \$360.

Additional Example 3B: Percent Increase and Decrease

B. Mr. Olsen has a computer business in which he sells everything at 40% above the wholesale price. If he purchased a printer for \$85 wholesale, what will be the retail price?

\$85 40% First find 40% of \$85.

\$85 0.40 = \$34 40% = 0.40

The amount of increase is \$34.

Think: The retail price is \$34 more than \$85.

\$85 + \$34 = \$119Add the amount of increase.

The retail price of this printer will be \$119.

Try This: Example 3A

A. Lily bought a dog house originally priced at \$750 that was on sale for 10% off. What was the sale price?

\$750 10% First find 10% of \$750.

\$750 0.10 = \$75 10% = 0.10

The amount of decrease is \$75.

Think: The reduced price is \$75 less than \$750.

\$750 – \$75 = \$675Subtract the amount of decrease.

The sale price of the dog house was \$675.

Try This: Example 3B

B. Barb has a grocery store in which she sells everything at 50% above the wholesale price. If she purchased a prime rib for \$30 wholesale, what will be the retail price?

\$30 50% First find 50% of \$30.

\$30 0.50 = \$15 50% = 0.50

The amount of increase is \$15.

Think: The retail price is \$15 more than \$30.

\$30 + \$15 = \$45 Add the amount of increase.

The retail price of the prime rib will be \$45.

04/13/2010 Proportion and Percent #23

Worksheet

LT: I will apply my understanding of ratios to solve problems involving proportional relationships, including percent.

Today’s Plan:

-Warm-Up

-Percent Increase and Decrease

-Assignment