Please help

Mike's Radiator Services specializes in the repair and replacement of radiators for passenger vehicles. Variable and fixed costs related to installation activities for the most recent month (January) are listed below: Required: 1. Caiculate the per unit amounts for each of the variable expense and fixed expense items in January. 2. Mike expects that 136 radiators will be installed in February and that this level of activity is within the relevant range for ail variable and fixed expenses. a \& b-1. Calculate the total expense and per unit amounts for each of the variable and fixed cost items above. (Round "per unit" answers to 2 decimal places.) b-2. Explain any differences in the per unit amounts between January and February. 3. Which, if any, of the costs shown above would be considered sunk costs? Why