I have a part-time job at the library that pays $10 per hour, 4 hours per day on Saturdays and Sundays.

I have a part-time job at the library that pays $10 per hour, 4 hours per day on Saturdays and Sundays. Some cousins want me to go on a weekend ski trip leaving Friday night and returning Monday morning. They estimate my share of the gas, motel, lift tickets, and other expenses to be around $50. What is my total economic cost of taking the ski trip?