Answer: A. Variable expenses go up by 25%.
Step-by-step explanation:
Total variable expenses are calculated on the basis of the entire units to be sold which means that if sales units were to increase by 25%, the total variable expenses will increase by 25% as well.
For instance, If selling price per unit is $4 and variables, $3 and the number of units to be sold is 20, sales will be $80 and variable costs will be $60.
Assuming units went up by 25% to 25 units, variable costs would be; $75 which is an increase of;
= (75 - 60) / 60
= 25%