Answer:
c. $191 Favorable
Explanation:
                                   Flexible budget   Planning budget   Activity variance 
Units produced              5,510 units            5,500 units
Revenue                         $237,481               $237,050
Total Expenses              ($207,340)            ($207,100)
Net Operating Income   $30,141                  $29,950                $191 F
<u>Workings</u>
Flexible budget revenue = 5,510 units*$43.10 = $237,481
Planning budget revenue =  5,500 units*$43.10 = $237,050
Flexible budget expenses =  $75,100 + $24*5510 = $207,340
Planning budget expenses = $75,100 + $24*5500 = $207,100