Attempting some quick math:
Avg hours per year: 1560h (30h * 52 weeks), delta avg +$4 per hour
500,000 * US$4 * 1560h = US$3,120,000,000 net increase.
Gross company + franchise operating expenses were $2,706,000,000 in 2023 [1].
115 Big Macs sold / day in California / restaurant [2] (45 restaurants?). About 1250 restaurants in CA.
Big Mac about $5.19 * 115BM/d * 1250r * 365d = $272,312,500 per year revenue for Big Macs.
So... $60 Big Mac? (corrected, see below)
[1] https://corporate.mcdonalds.com/content/dam/sites/corp/nfl/p...