11. If the activity level decreases, what happens to the unit fixed cost? a. It decreases. b. It increases. c. It remains the same. d. It depends on how much the activity level increases. 12. Georgiana operates a nail salon. She is trying to plan her costs for the next month and is uncertain of how to estimate those costs. Help her estimate next month's costs given the following information she collected, based on number of customers per month. Number of Customers 1,300 1,800 1,500 1,200 Nail supplies $4,030 $5,580 $4,650 $3,720 Equipment Rental 2,200 2,200 2,200 2,200 Electricity 274 364 310 256 Total $6,504 $8,144 $7.160 $6,176 If Georgiana estimates 1,400 customers next month, what is the estimated cost for nail supplies? a. $4,030 b. $4,340 C. $4,650 d. $3,720