Final answer:
To calculate the total cost of the drum set with sales tax, multiply the price by the sales tax rate, round to the nearest cent, and then add the sales tax to the original price. Preston's drum set costs $202.93 with sales tax.
Step-by-step explanation:
First, we need to find the amount of sales tax that Preston must pay on the drum set. To calculate the sales tax, we will convert the percent to a decimal and then multiply it by the total cost of the drum set. In the student's question, the sales tax rate is given as 0.08 (which corresponds to 8% when converted from a decimal).
To compute the sales tax:
187.90 × 0.08 = 15.032. Now, we round this to the nearest cent, resulting in $15.03 in sales tax.
The final step is to add this sales tax to the original price of the drum set to find the total cost with tax:
187.90 + 15.03 = 202.93.
Therefore, the total cost of the drum set with sales tax is $202.93.