During February of 2015, "Mitochondria: Powerhouse of the Cell Phone," at company selling cell phones, had a monthly marginal cost function given by CF '(zc) = 0.02:1:2 2:1: + 223 dollars per cell phone when :6 phones are made. During March of that same year, the company had a monthly marginal cost function of CM '(m) 2 0.04m2 3.2% + 223 dollars per cell phone when :16 phones are made. If the company sold 60 cell phones during each of these months, the monthly costs in ? v were lower by i, dollars