There are three cell phone models in a store. when selecting a new cell phone, 25% of the customers choose model a, 33% choose model b, and 32% choose model c. the remaining customers buy from an old collection on which the average profit is $50. if the average profit earned on models a, b, and c is $60, $75, and $40, respectively, what is the expected value of the profit earned on all models?
a] $55.75

b] $57.55

c] $59.25

d] $60.25