Sam's utility function is given by U(X1, X2) = 9.8 In( X1 ) + 6.7In(x2) where x; denotes the quantity consumed of good i, i =1, 2. Enter below the value of Sam's marginal rate of substitution of good 2 in terms of good 1 at the bundle (point) where x1 = 7 and X2 = 5