51. Geometry Each grid square in the figure below is the same size. What percent of the figure is red?

    

    C Challenge

52. Shopping Marcia buys a dress that is on sale for 15% off its original price. She uses a store coupon to obtain an additional 10% off the sale price. Marcia pays $91.80 for the dress. What was the original price of the dress?
53. Public Transportation In Mr. Ferreira's class, 80% of the students live more than half a mile from school. Of those students, 80% come to school by public transportation. Of the students using public transportation, 75% take the bus, and 75% of those students buy monthly bus passes. Nine students buy monthly bus passes. How many students are in Mr. Ferreira's class?

Standardized Test Prep

SAT/ACT

54. A rare disease has been discovered that affects 2 out of every 10,000 trees in a forest. What percent of trees are affected?
    1. 0.0002%
    2. 0.002%
    3. 0.02%
    4. 0.2%
55. One kilometer equals about 5 8 5 eighths  mi. A European racecar driver is driving at 120 km/h. Approximately what is this speed in miles per hour?
    6. 75 mi/h
    7. 100 mi/h
    8. 160 mi/h
    9. 192 mi/h
56. What is the solution of x 2 + x 3 − 15 = 0 ? x over 2 , plus , x over 3 , minus 15 equals 0 question mark
    1. 12
    2. 18
    3. 24
    4. 30

Mixed Review

See Lesson 2-8.

57. Art A painting 36 cm wide and 22.5 cm tall is going to be reproduced on a postcard. The image on the postcard will be 9 cm tall. How wide will the image be?

    See Lesson 2-7.

58. Cats Alexis's cat eats 3 cans of cat food every 5 days. Alexis is going away for 30 days. A friend has offered to feed her cat. How many cans of cat food must Alexis leave for her cat while she is away?

    See Lesson 2-7.

59. Taxis A taxi charges $1.75 for the first 1 8 1 eighth  mi and $.30 for each additional 1 8 1 eighth  mi. Write an equation that gives the cost c of a taxi ride in terms of the number of miles m. How many miles did you travel if a ride costs $7.75?

Get Ready! To prepare for Lesson 2–10, do Exercises 60–62.

See Lesson 2-9.

Solve each percent problem.

60. What percent of 8 is 100?
61. What is 20% of 3?
62. 35 is what percent of 20?

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