The amount of the check was $85.00. Once they left the tip, they had spent $99.45. What is the percentage of Melinda's family's tip

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Answer 1

Hi Michael, let x represent the tip. We can set up the following equation:

 

85.00 + 85.00 * x = 99.45

 

I do not like to work with decimals, so multiply each term by 100:

 

8500 + 8500x = 9945

 

Subtract 8500 from both sides:

 

8500x = 1445

 

Divide both sides by 8500:

 

x = .17

 

Melinda's family left a tip of 17%.

 

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