Let x--------->number of products y1--------> <span>the cost of producing a product y2------> </span><span>the cost of sell a product </span><span> we know that y1=120,000+20x-------> equation 1 y2=50x------> equation 2
equate equation 1 and equation 2 120,000+20x=50x 50x-20x=120,000 30x=120,000 x=4000