Pls shows steps and algorythm

In early July, Mike Gottfried purchased a $70 ticket to the December 15 game of the Chicago Titans. (The Titans

belong to the Midwest Football League and play their games outdoors on the shore of Lake Michigan.) Parking for the

game was expected to cost approximately $22, and Gottfried would probably spend another $15 for a souvenir

program and food. It is now December 14. The Titans were having a miserable season and the temperature was

expected to peak at 5 degrees on game day. Mike therefore decided to skip the game and took his wife to the movies,

with tickets and dinner costing $50. The sunk cost associated with this decision situation is: