Digital Cellular sells phones for $100. The unit variable cost per phone is $50 plus a selling commission of 104. Fixed manufacturing costs total 51,250 per month, while lived selling and administrative costs total $2,500. Required: What is the contribution margin per phone? b What is the beleven point in phones? e How many phone must be sold to eam pretax income of $7,500 Arial 3 (121) THE IE Q130