math

posted by Taylor

a bus ticket is $40 plus 5% tax.

  1. Ms. Sue

    40 * 1.05 =

  2. Taylor

    how did you get 1.05

  3. John

    Ok, 5% = 5/100.
    Thus, 5% tax is equal to 0.05.
    The tax is equal to 0.05 * (the before tax cost = 40). Then, you add the price of the ticket back.

    You can take a shortcut by doing 100% + 5% = 105% * 40 = 1.05 * 40 = ?

  4. Ms. Sue

    100 = 100%
    0.05 = 5%

    You could do the same problem by first taking 5% of 40, and then adding the product to 40.

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