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英文函数题A vendor can sell 500 souvenirs per day at a price of $

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英文函数题
A vendor can sell 500 souvenirs per day at a price of $3.00 each.Each increase of 30¢ in price decreases the number of sales by 25 per day.Souvenirs cost the vendor $1.60 each.What price should be charged to maximize profit?
英文函数题A vendor can sell 500 souvenirs per day at a price of $
assume the price=x
assume total income=y
then y=(500-(x-3.00)*25/0.3)*(x)
ok now we can solve this function
find out at what value of x one can have maximum y.