Answer:
part 1: $532.95. Part 2: 16
Explanation:
Part 1: 15 * 15.35 = 230.25
30 * 10.09 = 302.70
230.25 + 302.70 = $532.95
Part 2: R = letters in the word desk
there are 4 letters in the word Desk
= = 2 * 2 * 2 * 2 = 4 * 4 = 16 subsets
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