The enzyme catalyzes the below reaction MAX -> MATT The kcat of the enzyme is 400 sec(-1). When [Et]= 10 nM and [MATT]=40M, the reaction

The enzyme catalyzes the below reaction

MAX -> MATT

The kcat of the enzyme is 400 sec(-1). When [Et]= 10 nM and [MATT]=40μM, the reaction velocity is 7.2 μM s(-1). Calculate Km for substrate MAX.