Data:
Bill: $93.50
tip: 20%
sales tax= 6%
To find the total you need to find the amount that add to the bill the tip percentage and the sales tax.
To find a x% of an amount you multiply the amount by x/100
20%:
[tex]93.50\cdot\frac{20}{100}=18.7[/tex]6%:
[tex]93.50\cdot\frac{6}{100}=5.61[/tex]Then, the final bill is: $117.81[tex]93.50+18.7+5.61=117.81[/tex]