Answer:
2.70 + 110% = 5.67$ per sandwich
110% out of 2.70 is 2.97, so 2.70+2.97 = 5.67
18.50 + 22% = 22.57$ total cost
22% out of 18.50 is 4.07, so 18.50+4.07 = 22.57
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