Island Beach Rentals uses flexible budgeting for cost control, Island Rentalsrents 10,800 room rentals during July, incurring indirect materials cost of $13,000. Its master budget for the year reflected an indirect materials cost (all variable) of $18,000 for a volume level of 14.400 room rentals A flexible budget for July should reflect indirect materials costs of Select one: A $13,000 B $13,500 C. $11.700 D. $13,975