SOLUTION: Which form would you find most convenient to use to calulate a tip of 20% on a meal that cost$45.00?

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Question 105986: Which form would you find most convenient to use to calulate a tip of 20% on a meal that cost$45.00?
Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
double the bill and move the decimal point one place to the left.
45*2=90 so the tip is $9.
Ed