A bike store is having trouble finding skilled labour to repair and service bikes. If there are only 120 labour hours available, which combination of repairs and services would optimise the total contribution to the business? Contribution per activity labour hours required per activity Repairs $ 160.00 Service $ 90.00 4 2 Expected customer demand 15 repairs 40 services A. Repairs 18, Services 24 B. Repairs 12, Services 36 C. Repairs 20, Services 20 D. Repairs 15, Services 30.