A restaurant has a monthly food cost of 31, liquor cost of 18, and a payroll cost of 32 in the same month that it has $15,750 in sales with a 72:28 food to liquor ratio. The cost of benefits is 19 of the payroll cost. What is the restaurant's prime cost for this month?
a) $4,996.25
b) $5,550.00
c) $6,075.00
d) $7,125.00