What would you do if you have a spare day?

Do you follow the market recently? Do you know s&p 500?

Suppose there are 12 cards, from 1 to 12. You can pay me some amount of money to draw a card, and I'll pay the number you drew. What amount are you willing to pay?

What if now we play this game for 1000 times, how much are you willing to pay?

Calculate the sum of all even numbers from 0 to 100.

You stand in front of 5 doors and you can randomly pick one to open. One has a prize of $10000 while others have a punishment of $1000 each behind the door. Suppose now you are offered an option. With this option, you can randomly pick one door and see what behind the door. How much is this option worth?