Catering business

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.

Correct result:

a =  158.5333

Solution:

$a={\displaystyle \frac{11767.50+2500.50}{90}}={\displaystyle \frac{2378}{15}}=158.5333$

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