Montealegre family has a catering business. In one birthday party, they charged their costumer 11,767.50 for a party of 90 persons and a service charge of 2,500.50. How much was the average cost per person? Please show your solution.

Result

a =  158.533

#### Solution:

$a=\dfrac{ 11767.50 + 2500.50 }{ 90 }=\dfrac{ 2378 }{ 15 } \doteq 158.5333 \doteq 158.533$

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