Betty 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. Nail supplies Equipment Rental Electricity Total Number of Customers 1390 1800 1500 $4309 $5580 $4650 2400 2400 2400 318 400 340 $7027 $8380 $7390 1250 $3875 2400 290 $6565 If Betty estimates 1490 customers next month, what is the estimated cost for nail supplies? $4309 $4650 $3875 $4619