Question

Miss Hoffman gave 90-cent tip to a waitress for serving a meal costing $6.00 what percent of the bill is her tip?

Answer 1

So,

Miss Hoffman gave 90 cents to the waitress.

Her meal, including the tip, cost $6, or 600 cents.

Her subtotal was represented by the quantity (600 - 90) cents.
600 - 90 = 510

Dividing 90 by 510 yields the percent tip that Miss Hoffman gave the waitress.
$\frac{90}{510}$
$\frac{9}{51}$
0.176 or 17.6% ≈ 18%

Miss Hoffman gave the waitress approximately 18% tip.