<PRE><B>Question 166260</B>
a.  d=600-40(5)=400  d=600-40(5.50)=380
    as the price increases the the # of cans decrease
b.  sales at $5 is 400(5)=2000  
    sales at $6 is 360(6)=2160
    sales at $7 is 320(7)=2240
  sales at $7.50 300(7.5)=2250
    sales at $8 is 280(8)=2240
   
    so sales rise on each $1 raise up to $7.50 then they begin to fall again.

c.I have no way to graph this</PRE>