SAT Mathematics Practice Test 4

Questions 41 and 42 refer to the. following information.

The bar graph above shows renewable energy consumption in quadrillions of British thermal units (Btu) in the United States, by energy source, for several energy sources in the years 2000 and 2010.

Question : 42 of 58

Marks: +1, -0

Of the following, which best approximates the percent decrease in consumption of wood power in the United States from 2000 to 2010 ?

Validate

Solution:

Reading the graph, the amount of wood power used in 2000 was 2.25 quadrillion BTUs and the amount used in 2010 was 2.00 quadrillion BTUs. To find the percent decrease, find the difference between the two numbers, divide by the original value, and then multiply by

100:{2.25-2.00}/2.25×100=0.25/2.25×100≈11.1

percent. Of the choices given, 11% is closest to the percent decrease in the consumption of wood power from 2000 to 2010
Choices A, C, and D are incorrect and may be the result of errors in reading the bar graph or in calculating the percent decrease.

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