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anonymous

  • 4 years ago

Mom pays $50.15 at a restaurant that included the meal and an 18% tip. What was the price of the meal alone? I know the answer is $42.50 but I don't know how to do the calculation.

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  1. anonymous
    • 4 years ago
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    41.12 + 18% is $48.52. The Final amount paid for the bill is $50.15. Right?

  2. anonymous
    • 4 years ago
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    42.50 = 18% (7.65) = 50.15. I just don't know how to get the 42.50 number to start with.

  3. anonymous
    • 4 years ago
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    \[P(1.18)=50.15\] \[P=50.15\div 1.18\]

  4. anonymous
    • 4 years ago
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    Bingo! Thanks Satellite73!

  5. anonymous
    • 4 years ago
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    Cross multiply and keep everything in proportion. For example: x/50.18 = 18/100 (solve for x). x comes out to be roughly 9.03 which is the COST of the tip. Simply subtract that from your grand total. 50.15 - 9.03 = 41.12

  6. anonymous
    • 4 years ago
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    you CANNOT do it by finding 18% of the total and subtracting, because 18% of the total is bigger than 18% of the original bill. it is a division problem, not a subtraction

  7. anonymous
    • 4 years ago
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    i repeat, you CANNOT do it by finding 18% of 50.15

  8. anonymous
    • 4 years ago
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    What was the method you use satellite. I understand it completely, but why 1.18?

  9. anonymous
    • 4 years ago
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    to increase a number by 18% you multiply by 1.18 so in this case you have to divide by 1.18 because you don't know the original number, but rather you know the answer

  10. anonymous
    • 4 years ago
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    luis rivera wrote it too as long as you know that \[x+.18x=1.18x\]

  11. anonymous
    • 4 years ago
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    Thanks Satellite73 and Luis Rivera! For me, dividing by the 1.18 is the easiest method. Thanks to both for taking the time.

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