Zai can make a doll worth Php55 for Christmas season. If she plan to sell is x pesos and the number of dolls sold per month is 500-x, express the monthly profit in pesos as a function of x.

Question

Please help me.

Answer 1

Profit, p, on one doll is selling price minus cost price (worth): p=x-55. But Zai plans to sell 500-x dolls in a month, so her monthly profit, P(x)=(500-x)p=(500-x)(x-55)=555x-27500-x^2.

Answer 2

Let profit p

Given

p = x-55

and total doll sell in a month = 500 -x

monthly profit = (500-x)p

= 500 - x (x - 55)

=555x - 27500 - x^2

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