<PRE><B>Question 980540</B>
PRICE___________CLIENTS_______________REVENUE
44_________________2000
44+1_____________2000-7
44+2____________2000-2*7
44+3____________2000-3*7
.
.
44+x___________2000-7x_____________(44+x)(2000-7x)


Revenue is y=(44+x)(2000-7x) which represents a parabola, convex upward.  Being found in factored form, the zeros are easy to find; and the vertex, a maximum, occurs in the exact middle of the roots (zeros).</PRE>