Yes we can conclude that Paul is maximizing his utility.
marginal utility of good b = MUb
price of good b = Pb
marginal utility of good d = MUd
price of good d = Pd
MUb / Pb = 20/6 = 3.33
MUd / Pd = 2/ 1 = 2
(MUb / Pb) > (MUd / Pd)
This is given that 3.33 is greater that 2.
Hence we have to say that he is maximizing his utility given that 3.33 is greater than 2.
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