Seventy Percent of a House Painter's Business Is Exterior Work

Seventy percent of a house painter's business is exterior work and the other thirty percent is interior. The average exterior paint job takes 20 hours of labor and $400 of paint and primer, but the average interior job takes only 6 hours of labor and $75 of paint and primer. If he gets 20 service calls for the coming month, which of the following resource requirements is correct?

A) The painter has supply costs of $4750 for next month.
B) The painter has a labor demand of 260 hours for next month.
C) The painter has supply costs of $6050 for next month.
D) The painter has a labor demand of 204 hours for next month.