The manager at Screaming Trees has been trying to calculate the portion of the? company's overhead expenses that is fixed and the portion that is variable. Over the past twelve? months, the number of yards of processed was highest in? July, when the total monthly overhead costs totaled $32,000 for 37,000 yards of mulch processed. The lowest number of yards of mulch processed in the last twelve months occurred in? October, when total overhead costs were $24,000 for 24,000 yards of mulch processed. What is the fixed portion of the monthly overhead? expenses?