At lunchtime, pete's chilly dogs sells hot dogs, chips, and soft drinks from five portable hot dog carts stationed on busy street corners. the depreciation cost on the carts is $1,000 per year for each cart. the company buys supplies (hot dogs, chips, cups, napkins) as needed. the 5 cart operators are each paid $8,000 per year plus 5% of sales revenue. the cost of supplies relative to the number of customers served at a particular hot dog cart and relative to the number of customers served by all five of the hot dog carts is, respectively: mixed. strategic. fixed. variable.