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1 March, 07:00

The air pressure inside Jason's bike tires decreases by about 6% each week. The original pressure was 45 pounds per square inch (psi). What is the tire pressure after 6 weeks?

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  1. 1 March, 07:18
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    Lets do this week by week

    beginning pressure 45 pounds

    end of week 1

    45 *.06 = 2.7

    45 - 2.7 = 42.3

    end of week 2

    42.3 *.06 = 2.538

    42.3 - 2.538 = 39.762

    end of week 3

    39.762 *.06 = 2.38

    39.762 - 2.38 = 37.37

    end of week 4

    37.37 *.06 = 2.2425

    37.37628 - 2.2425 = 35.12

    end of week 5

    35.12 *.06 = 2.107

    35.12 - 2.107 = 33.012

    end of week 6

    33.012 *.06 = 1.98

    33.012 - 1.98 = 31.03

    Here is the fast way to get to this answer.

    do 1-.06 =.94

    then do

    45 (.94) (.94) (.94) (.94) (.94) (.94) = 31.04
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