Lonely Guy Repair Service Recently Performed Repair Services for a Customer

Multiple Choice

Lonely Guy Repair Service recently performed repair services for a customer that totaled $400.Somehow the bill was lost and the company accountant was trying to recreate the bill from memory.This is what was remembered: $$\begin{array} { l l } \text { Total bill } & \$ 600 \\\text { Labor profit margin } & \$ 10 \\\text { Materials profit margin } & 20 \% \\\text { Total labor charges } & \$ 390 \\\text { Cost of materials used } & \$ 120 \\\text { Total hourly cost } & \$ 22.50\end{array}$$
-What was the material loading charge?

A) 37.5%
B) 43.8%
C) 61.3%
D) 75%