Not too sure about this problem

Use the table below to answer questions the following three questions. Athena has $60 of birthday money that she is going to spend on Lego Sets and Barbie Dolls. Lego Sets cost $20 each and Barbie Dolls cost $10 each. Lego Total MU Sets Utility MU/$ 1 60 2 110 3 150 4 170 5 150 Barbie Total MU Dolls Utility MU/$ 1 60 2 110 3 150 4 180 5 190 Fill out the table completely with the marginal utility and marginal utility per dollar for Lego Sets and Barbie Dolls respectively. Do not using any units or dollar signs, simply enter the number (i.e. 7, 5.5 or -3)