Question 1162220
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Let x = the number of the $24.99 cartridges sold.


Then the number of the $15.99 cartridges is (47-x).


The equation for total money received is


    24.99x + 15.99*(47-x) = 940.53.


From the equation,


    x = {{{(940.53-15.99*47)/(24.99-15.99)}}} = 21.


<U>ANSWER</U>.  21 cartridge at $24.99  and  the rest, 47-21 = 26 cartridges at $15.99.
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Solved.