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

$

Aubrey's dinner cost $85 \$ 85 . She tips the waitstaff 30% 30 \% for excellent service.\newlineHow much does Aubrey tip the waitstaff?\newline$ \$

Full solution

Q. Aubrey's dinner cost $85 \$ 85 . She tips the waitstaff 30% 30 \% for excellent service.\newlineHow much does Aubrey tip the waitstaff?\newline$ \$
  1. Convert to Decimal: Determine the percentage of the tip in decimal form.\newlineTo calculate the tip, we need to convert the percentage to a decimal. To do this, we divide the percentage by 100100.\newline30%÷100=0.3030\% \div 100 = 0.30
  2. Calculate Tip Amount: Calculate the tip amount by multiplying the cost of dinner by the decimal form of the tip percentage.\newlineAubrey's dinner cost $85\$85, and the tip percentage in decimal form is 0.300.30. So, we multiply these two values to find the tip amount.\newline$85×0.30=$25.50\$85 \times 0.30 = \$25.50
  3. Verify Calculation: Check the calculation for any mathematical errors.\newlineWe can verify the multiplication by approximating. 30%30\% is close to one-third, and one-third of $90\$90 (which is close to $85\$85) would be $30\$30. Since our result is a bit less than $30\$30, it seems reasonable given that $85\$85 is less than $90\$90.

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