California Math Triumphs Vol 3B RATIOS (CALIFORNIA MATH by MACMILLAN

By MACMILLAN

Ratios premiums & Percents

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Copyright © by The McGraw-Hill Companies, Inc. 50 = 2 · y 2y 6 ___ __ = 2 2 3=y Cross multiply. Divide by 2. 12 bagels would cost $3. Example 1 Determine whether the ratios are proportional. 7 _3 = _ 4 21 1. Find the cross products. 2. The cross products are not equal. Therefore, the ratios are not proportional. 46 Chapter 4 Rates and Proportional Reasoning 3 · 21 = 7 · 4 63 ≠ 28 YOUR TURN! Determine whether the ratios are proportional. 4 _2 = _ 5 10 2 · 10 = 4 · 5 1. Find the cross products. 20 = 20 2.

Check each answer. 10 What is 22% of 740? 8 11 What is 7% of 810? 7 Example 2 What is 12% of 400? 12 What percent is 140 of 200? 70% Write the percent equation. Substitute the known numbers and variables. Solve for the variable. 13 What percent is 26 of 520? 5% Check your answer. 12 · 400 = 48 ✓ 3-2 Solve Percent Problems SHOPPING Derrick bought an MP3 player that cost $199. 25% sales tax. How much did he pay in tax? 43 15 SALES Debra earns 3% commission on the sale of a home she lists. Last week she sold a home and earned $10,140 in commission.

To the nearest tenth, what is the percent of change? BOäLCä4LQBOP 10      *>PQä7B>O 2EFPä7B>O Chapter Study Guide 3 Vocabulary and Concept Check commission, p. 11 Write the vocabulary word that completes each sentence. compound interest, p. 21 1 principal The money deposited or invested. 2 decrease A(n) occurs when the original quantity becomes smaller in value. cross products, p. 11 decrease, p. 29 increase, p. 29 principal, p. 21 3 proportion, p. 11 simple interest, p. 21 When interest is earned on both the principal and any interest already earned, it is known as compound interest 4 is the amount of .

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