Calculate the Ki for a competitive inhibitor (I) form the following data by Dixon Plot.
Inhibitor Concentration (mM) : 0, 0.5, 1.0, 1.5, 2.0, 3.0;
Velocity (mM/min) in the presence of 5mM substrate: 0.38, 0.26, 0.21, 0.17, 0.14, 0.10;
Velocity (mM/min) in the presence of 10mM substrate: 0.71, 0.59, 0.48, 0.42, 0.36, 0.29;