C-1) Take the last digit of your student ID as "N. If N 5, please use N members in the public goods game. For example, the student ID is 1D12345678, and then N = 8. There are 8 members in the public goods game. If N < 5, please use (9 - N) members in the public goods game. For example, the student ID is 1D87651234, and then (9 - N) = 9 - 4 = 5. There are 5 members in the public goods game. Imagine that you are participating in the public goods game conducted with the initial endowment of 20 tokens for each of the N (or 9 - N) members. Earning from the project is calculated as Earning from the project = 0.3 the total contribution number C-1-1) Assume that the sum of the contributions by the other group members is 50 tokens. If you contribute 0 tokens, then how many tokens do you earn? C-1-2) Assume that the sum of the contributions by the other group members is 60 tokens. If you contribute 10 tokens, then how many tokens do you earn? C-1-3) Assume that everyone including you have contributed everything in the project, how much tokens do you earn? C-1-4) Explain the properties of the public goods