Ringing Solutions produces 12.000 units of a cell phone. The production requires prime costs of $440,000. uses 2,800 machine hours, and takes 1.800 setup hours. The activity rates are $50 per machine hour and $100 per setup hour. What is the unit cost of a cell phone? (Note: Round answer to two decimal places.) O $64.50 O $64.35 O $63.33 O $62.65 O $50.55