can someone explain to me why the answer is D?

The following information is available pertaining to the Production Division: Mixing Dept. Finishing Dept Overhead costs $7,500 $22,500 Direct labor hours 7,500 2,500 Machine hours 2,500 7,500 Total $30,000 10,000 10,000 Production information pertaining to Job 4XS: Mixing Dept. $1,250 250 Finishing Dept. $-0- -0- Total $1,250 250 Prime costs Direct labor hours Machine hours Units produced 500 500 77. Refer to Figure 5-2. What are the total overhead costs assigned to Job 4X5, asyuming the Mixing and #Finishing Departments use direct labor hours and machine hours for their basc, respectively? a. $62.50 b. $1,500.00 c. $750.00 a $250.000 ANS: D