Donny, of Donny's Doughnuts, bakes and sells $100$ dozen doughnuts a day using one mixer and one fryer. His rival, Sunshine,

of Sunshine's Doughnuts, produces $180$ dozen doughnuts a day using two mixers and two fryers. Both shops use the exact same

echnology to make doughnuts and have the same number of workers and the same size building.

Donny and Sunshine both increase their capital equipment by one mixer and one fryer.