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x = original price (such as dinner) x+x(tip)+x(tax) Your tip being 20% and tax being 7.75%, it would look like this:
x+x(.20)+x(0.0775)


So if dinner was $100, it would look like:
100 + 100(.2) + 100(0.0775)
100 + 20 + 7.75
= 127.75

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Q: What is formula for 20 percent tip and 7.75 tax?
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