Cost of the spa treatment = $42 Percentage of sales tax = 6% Percentage of tips = 20% Normally the tips amount is calculated before adding sales tax. Then Amount of tips given = (20/100) * 42 = (1/5) * 42 = 8.40 dollars Amount of sales tax taken = (6/100) * 42 = 252/100 = 2.52 dollars Then The total amount spent for spa treatment = (42 + 8.40 + 2.52) dollars = 52.92 dollars So we can see that $52.92 has been spent in total for spa treatment and this amount includes a sales tax of $2.52 and a tip of $8.40.
