QUESTION 7 1.0 An analysis of past maintenance costs indicates that maintenance cost is an a machine-hour at an activity level of 16,000 machine-hours. Assuming that this activity is within the 18,500 machine-hours? s verage of $0.40 per machine-hour at an activity level of 20,000 machine-hours and $0.50 per nelevant range, what is the total expected maintenance cost if the activity level is o $1,500 ?$8,960 o$8,000 $9.000