GED Math Extra Prep: Percentages - dummies

By Consumer Dummies

Percentage questions on the GED Math test will generally ask you to compare different quantities. In the following practice questions, you’re asked to calculate a percentage change over time, and then to calculate a percentage of a total amount.

Practice Questions

  1. A plane has a seating capacity of 160 passengers, 40 in first class and the rest in economy class. The average first-class ticket costs $1,200, and the average ticket in economy class is $400. The price of each first-class ticket used to be $1,500. What percent decrease does the current price represent?

    A. 20%
    B. 25%
    C. 75%
    D. 80%

    The next question is based on the following information.

    The details of Janet’s paycheck are shown here.

    GED_paycheck

  2. What percentage of her gross salary does Janet pay toward Social Security? Round your answer to the nearest tenth of a percent.

    A. 0.03%
    B. 2.7%
    C. 0.3%
    D. 26.7%

Answers and Explanations

  1. The correct answer is A.

    Calculate the percent decrease as follows:

    GED_1502

    Substituting in the new and old prices of the ticket gives you

    GED_1503

    Hence, Choice (A) is the correct answer.

  2. The correct answer is B.

    Divide the amount spent on Social Security by the gross salary and multiply by 100:

    GED_1504

    Rounding the nearest tenth of a percent gives you 2.7%, so Choice (B) is correct.