Answer:
$4.76
Explanation:
Take the cost of the sandwich (2.80) and multiply it by the percentage, 170% (which can be written as 1.70).
2.80 × 1.70 = 4.76
The selling price of the sandwich is $4.76.
Tip: When finding the percentage of a number, take the given percentage (in this case, 170%), divide it by 100 (resulting in 1.70), and multiply the number by the new percentage.