26.38
5.5%=.055
.055x25=1.375(1.38)
25+1.38=26.38
Start with

Multiply both sides by 5:

Answer:
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106/120 = .8833 complaints per hour i think.
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7 + 18 = 25
25 ÷ 7 = 3.5714285714285714285
so 3.5714285714285714285 is the answer