class N earns 50% on MU

You can earn Miles on all flights marketed MU, FM, AF, KL or SkyTeam and operated by China Eastern or Shanghai Airlines.

First Class:
150% – F
125% - P
Business Class:
125% – C, J, Z, O
Economy Class:
100% – Y, B
75% – E, H
50% – L, M, N, R, S, V, T

http://www.klm.com/travel/fr_en/flyi...ners/index.htm