12) C
Customer 1 was not refunded any money because the train arrived only 1 minute late.
Customer 2 was not refunded any money.
Customer 3 would have been refunded $6 since their trains was more than 20 minutes late.
Customer 4 would have been refunded $4 since their trains was more than 10 minutes late but less than 20 minutes late.
Customer 5 would not have been refunded any money.
Customer 6 would not have been refunded any money.
Customer 7 would not have been refunded any money.
Customer 8 would not have been refunded any money.
Customer 9 would have been refunded $6 since their trains was more than 20 minutes late.
Customer 10 would have been refunded $6 since their trains was more than 20 minutes late.
Total money refunded by company = 6 + 4 + 6 + 6 = $22
So the answer is C.