A consumer has utility given by U = x3x2, where the marginal utilities for good 1 and 2 are 1/2 1/3 given by MU1 = . *2 3 2/3 and MU2 = 2 1/2 What is the MRS when x, = 4 and x2 = 6? Enter a numerical value below. Round to the second decimal if necessary. Include a negative sign if necessary