Grade criteria

Each of the problems 1, 2a, 2b, 2c, 3, 4a, 4b, 5 counted 12.5 points, so that the maximal score was 100. The following scale was used:

85 - 100   A

75 - 84   B

50 - 74   C

40 - 49   D

35 - 39   E

0 - 34   F