Andy had a large collection of trading cards of famous soccer players. Many of his cards featured either Neymar (15%) or Mbappe (10%). However, Andy grew increasing discontent with Neymar’s behavior (as a “diver”) and traded all of his Neymar cards for other cards. Since Neymar cards were still quite valuable despite his antics, he managed to trade one Neymar card for 3 other cards (but none of them featured Mbappe). After the trade, what fraction of his cards feature Mbappe?
