New SAT Math Workbook

Petersonscom verbal problems involving percent 87 1

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Unformatted text preview: percent by multiplying by 100. Example: The number of automobiles sold by the Cadcoln Dealership increased from 300 one year to 400 the following year. What was the percent of increase? Solution: There was an increase of 100, which must be compared to the original 300. 100 1 1 = = 33 % 3 300 3 Example: The Sunset School dismisses 20% of its staff of 150 due to budgetary problems. By what percent must it now increase its staff to return to the previous level? Solution: 20% = 1 5 1 · 150 = 30 5 The school now has 150 – 30 or 120 employees. To increase by 30, the percent of increase is 30 1 = = 25%. 120 4 Exercise 1 Work out each problem. Circle the letter that appears before your answer. 1. Mrs. Morris receives a salary raise from $25,000 to $27,500. Find the percent of increase. (A) 9 (B) 10 (C) 90 (D) 15 (E) 25 The population of Stormville has increased from 80,000 to 100,000 in the last twenty years. Find the percent of increase. (A) 20 (B) 25 (C) 80 (D) 60 (E) 10 The value of Super Company Stock dropped from $25 a share to $21 a share. Find the percent of decrease. (A) 4 (B) 8 (C) 12 (D) 16 (E) 20 4. The Rubins bought their home for $30,000 and sold it for $60,000. What was the percent of increase? (A) 100 (B) 50 (C) 200 (D) 300 (E) 150 During the pre-holiday rush, Martin’s Department Store increased its sales staff from 150 to 200 persons. By what percent must it now decrease its sales staff to return to the usual number of salespersons? (A) 25 (B) (C) (D) (E) 33 20 40 75 1 3 2. 5. 3. www.petersons.com 88 Chapter 6 2. DISCOUNT A discount is usually expressed as a percent of the marked price, which will be deducted from the marked price to determine the sale price. If an article is sold at a 20% discount, the buyer pays 80% of the marked price. Instead of first finding the amount of discount by finding 20% of the marked price and subtracting to find the sale price, it is shorter and easier to find 80% of the marked price directly. Example: A store offers a 25% discount on all a...
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