You have a fortune$-$telling business where you use a rented van as your place of business. On any day you do not read fortunes, you can earn $1500$ as a barista. You paid $10,000$ to rent a van for the month. If you canceled the rental, you would have gotten back $4000.$ If you rented it to Alvaro, he would have given you $20,000$ for the month. Instead, you used it to read fortunes for $20$ days, paying yourself a salary of $15,000(750$ per day$).$ With $$number of fortune$-$telling days$$ your quantity variable, what were your average variable costs?