The last two columns on the right in ViewMate 79365 are for cash back payments. Vreemde munt means foreign currency and Ned. crt. probably means the corresponding amount in Netherlands currency (the guilder, abbreviated by the symbol f. or fl.). I don't know what the exchange rates would have been, but I'm guessing that R323.80 means that Marcus had 323.80 in rubles, which was exchanged for 404.75 guilders.

We can check to see if this is reasonable by using historical exchange rates for that time period. According to https://www.anaga.ru/kurs.htm (in Russian), $1 was worth 1.94 rubles in 1897. According to https://en.wikipedia.org/wiki/Dutch_guilder, $1 was worth about 2.46 guilders in 1914. Using these exchange rates, 323.80 rubles would have been worth $166.90, or 410.59 guilders. So my interpretation of those columns seems to make sense.