Michaelis Menten Equation question for simplification when D

Solution

we have to calculate Km when [S]=40, so after puttinf in eqn 1st

9.6/12=40/ (Km + 40)

9.6Km + 9.6 x 40 = 12 x 40

9.6Km + 384= 480

9.6Km = 480-384= 96

Km=96/9.6 =10

thats all