Question 1197959
<pre>
                      PRICE              QUANTY          COST

EXPECTED                  30                  28           30*28

CONDITION Change          (30*28)/21          21           30*28
</pre>
Notice in the expression for what is asked for,  
{{{(30*28)/21}}}

{{{30(28/21)}}}

{{{30*(4/3)}}}-------and you might be able to see this simpler fraction as a shortcut, possibly
letting you skip some written steps.


{{{30(4/3)=10*4=highlight(40)}}}