Aubrey's dinner cost $85 . she tips the waitstaff 30% for excellent service. how much does aubrey tip the waitstaff?

To solve this problem, we must figure out what 30% of $85 is. To do this, we must first convert 30% to its decimal equivalent. We divide 30/100 to find the decimal because percentages are portions of 100.

30/100 = 0.3

Next, we must multiply this decimal by $85. We do this because the word "of" in mathematics implies that we must use multiplication.

0.3 * 85 = 25.5

Therefore, Aubrey tips the waitstaff $25.50.

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