Question 1100320
46.99 -20% discount is 46.99*0.8=$37.59
C=79+(37.59)10=$79+$375.90=$454.90
or, for the other
C=79+27.99(10)=$79+279.90=$358.90
It isn't clear which 10 boxes, and it could even be some of each.
That would be C=79+37.59(x)+27.99(10-x), where x is the larger diaper box.