MTH 121 Sec 7 4 percents

# MTH 121 Sec 7 4 percents - Application Solve the following...

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MTH 121 Section 7.4: Percent Notes I. Modeling Percents What does percent mean? Why is the decimal square a good model for percents? Name the following percents Model the following percents on the hundred squares provided 46% 19% 22.5% II. Changing the Whole Why is modeling percents on a hundred square so easy?

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What happens if we change the whole? For 75% of 100 shade ________ boxes and 75% of 100 = But what if we want 75% of 350, what does this equal? (Model on the hundred square to help calculate) Find 7% of 350 Find 205% of 350 Now what if the whole is 60. Find 75% of 60 Find 7% of 60 Find 205% of 60
Application: Solve the following problem A car was purchased for \$13,000 with a 20% down payment. How much was the down payment What if we know 75% of the whole is 60. Now what don’t we know?

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Let’s find it If 150 is 20 % of the whole, what’s the whole?

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Unformatted text preview: Application: Solve the following problem One hundred sixty-two seniors, which is 90% of the senior class, are going on a class trip. How many seniors are in the class? Now we know the whole is 500. If we are only considering 100 out of the 500 what percent is this? The whole is 30, we only want 25. What percent is this? Application : You buy a car for \$22,500 and put \$3,600 down. What percent did you put down? Summary: When dealing with problems involving percents, there are 3 pieces we need to consider. What are those 3 pieces of the problem? 1. 2. 3. At any time if we want to solve for one piece how many other pieces of the problem must be given to us? Tips: 1. Keep track of what’s what-Percent is part of the whole (the whole always follows the word of !) 2. Draw a picture...
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## This note was uploaded on 10/11/2011 for the course MTH 121 taught by Professor Staff during the Spring '11 term at Moraine Valley Community College.

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MTH 121 Sec 7 4 percents - Application Solve the following...

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