a (For this question, please answer in the box below) Joe has a small kiosk at a local shopping mall. Joe only sells mobile phone cases and he charges $18 per cell phone case. His monthly rent for the kiosk is $1,450 and he pays himself a monthly salary of $1,800. Other expenses average $150 per month On average, it costs Joe $5.65 for each mobile phone case. How many phone cases does Joe need to sell each month in order to break-even? (Round up your answer.)