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4 August, 00:12

Your lunch bill is $9.87 plus tax. How much should you tip? Use 20%

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  1. 4 August, 00:15
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    The tip should be 2.70 i believe i also did mental math.
  2. 4 August, 00:29
    0
    Heres a really simple way to calculate the percent of a number when the percent is a multiple of 10 (10%, 20%, 30% etc.)

    take the number, in your case $9.87

    now move the decimal 1 spot to the left

    this will give you $0.987 or 98.7 cents

    this number is 10% of the total value of the number

    to get 20% of the number, simply double it

    .987*2 = $1.974

    when dealing with money and other things in which it is not possible to split up into fractions of the object (you cannot have a fraction of a penny) you round down to the nearest cent

    in this case, round to $1.97
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