Question 1202009
<pre>
                CHARGE RATE          QUANTITY        REVENUE
LARGE                8                   v             8v
SMALL                5                  80-v           5(80-v)
TOTALS                                  80             550
</pre>



Money charged as H dollars for large and L dollars for small
total items handled, M
total revenue, R
<pre>
                CHARGE RATE          QUANTITY        REVENUE
LARGE                H                   v             Hv
SMALL                L                  M-v           L(M-v)
TOTALS                                  M             R
</pre>
{{{highlight_green(Hv+L(M-v)=R)}}}

{{{Hv+LM-Lv=R}}}

{{{(H-L)v=R-LM}}}

{{{highlight(v=(R-LM)/(H-L))}}}


Substitute your given values which are
H=8
L=5
M=80
R=550