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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

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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

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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.

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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.

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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.

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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.

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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