Need the answer for net operating income, I've tried 420 but it says I am not correct.

Via to is a popular neighborhood gelato shop. The company has provided the following data concerning its operations Fixed Variable Actua Element Element Total for per Month per Liter June $32.00 $192,540 Revenue Raw materials 6.65 41,930 7,600 3.40 28,100 Wages Utilities 3,630 2.20 17,500 4,600 $4,600 Rent 3,350 3,350 Insurance Miscellaneous 850 2.35 15,190 While gelato is sold by the cone or cup, the shop measures its activity in terms of the total number of liters of gelato sold. For example, wages should be $7,600 plus $3.40 per liter of gelato sold and the actual wages for June were $28,100. Via Gelato expected to sell 6,000 liters in June, but actually sold 6,200 liters. Required