Melony is a small business that sells athletic wear by the set and wants to make $600 in operating income for the month. Melony sells each set for $75 and has variable costs of $45 per set. Total fixed costs for the month is $300. Required: Calculate the following: . a) Contribution margin per unit sold (4 pts) b) Contribution margin ratio (4 pts) c) Breakeven point in units (4 pts) d) Units to be sold to earn the targeted operating income (4 pts) Assume Melony sells 25 sets in a given month, calculate her margin of safety and indicate if this is a risky business. (4 pts) (Total 20pts)