Coty has agreed to buy a 20 percent stake in Kim Kardashian West’s make-up brand KKW for $200m, just months after the American multinational beauty company closed a $600m deal with her sister, Kylie Jenner.    According to the Financial Times, the deal values Kim’s cosmetics company at $1bn, slightly lower than the $1.2 billion valuations Coty put on West’s half-sister Kylie Jenner’s business when it bought a 51 percent stake last year.    By buying only a minority stake …