单项选择题

Cardio Co manufactures three types of fitness equipment: treadmills (T), cross trainers (C) and rowing machines (R). The budgeted sales prices and volumes for the next year are as follows:
Labour costs are 60% fixed and 40% variable. General fixed overheads excluding any fixed labour costs are expected to be $55,000 for the next year.
What is the weighted average contribution to sales ratio for Cardio Co. ? 
A、60.92%
B、60.75%
C、60.22%
D、62.07%