XYZ Computer Company has a monopoly on the sale of a specialized color printer. If it sells two of these printers its total revenue is $1,000, and if it sells three color printers its total revenue is $1,400. The marginal revenue of the third color printer sold is .

Salge inc. bases its manufacturing overhead budget on budgeted direct labor-hours. the variable overhead rate is $8.10 per direct labor-hour. the company's budgeted fixed manufacturing overhead is $74,730 per month, which includes depreciation of $20,670. all other fixed manufacturing overhead costs represent current cash flows. the direct labor budget indicates that 5,300 direct labor-hours will be required in september. the company recomputes its predetermined overhead rate every month. the predetermined overhead rate for september should be: