Aresearcher synthesizes a new molecule called inhibitor x that inhibits the activity of phosphofructokinase (pfk), the enzyme that phosphorylates fructose 6-phosphate during glycolysis. inhibitor x competes with atp for binding to the pfk active site. the researcher determines that the michaelis-menten constant (km) with respect to atp is 40 μm. when 2 μm inhibitor x is added to the purified pfk reaction, the apparent km for atp increases to 48 um. calculate the dissociation constant of the pfk-inhibitor complex (k1).