Question 1016042
 s(p)=-2p^2+80p+1250
The vertex is the highest point (-x^2) and the value of p=-b/2a, which is -80/-4 or 20.
When p=20, s(20)=-800+1600+1250=$2050.
{{{graph(300,200,-8,40,-10,2500,-2x^2+80x+1250)}}}