Final answer:
The variable medical expenses that should be charged to operating departments at the end of May for performance evaluation purposes is b. $49,500.
Step-by-step explanation:
To determine the variable medical expenses that should be charged to operating departments at the end of May, we need to calculate the budgeted variable medical expenses per employee and multiply it by the actual number of employees in the operating departments.
Step 1: Calculate the budgeted variable medical expenses per employee: $25
Step 2: Calculate the variable medical expenses based on the actual number of employees: $25 x 1,980 = $49,500
Hence, the variable medical expenses that should be charged to operating departments at the end of May for performance evaluation purposes is $49,500.