74) Sportstuff, Inc. is investigating the feasibility of adding a new skateboard to its line-up of products. The marketing department believes that 10,000 units can be sold at $90 each. Sportstuff requires a 25% profit margin (i.e. cost is 75% of selling price) on all products. To achieve its goal, Sportstuff must keep per-unit costs equal to or less than: a) $22.50 b) $67.50 c) $50.63 d) $90.00