Question 1127515
.
<pre>
Your money equation is


    300*H + 100*((40-H) = 8400    dollars


where H = "How many boxes of hammers are in the order".


    H = {{{(8400-100*40)/(300-100)}}} = 22.    <U>ANSWER</U>


<U>CHECK</U>.  300*22 + 100*(40-22) = 8400  dollars.   ! Correct !
</pre>