Question 1170670
.
A small canteen offers special meal package to their customers. The profit P that the canteen 
will earn at x number of customer is modeled by the function P(x) = -25x2 + 100x  -  3000. 
How many people are needed for a profit of atleast
Php5,000
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In this problem,  the profit


            P(x) = -25x^2 + 100x - 3000 = (-25x^2 + 100x - 100) - 3000 + 100  = -(5x-10)^2 - 2900


is  NEVER  a positive value - it  ALWAYS  is negative.



The problem itself  HAS  NO  ANY  SENSE.


It is a  FAKE  created by mathematically illiterate person.


See the plot below.



    {{{graph( 400, 400, -20, 20, -5000, 1000,
          -25x^2 + 100x - 3000     
)}}}



                Plot y = -25x^2 + 100x - 3000