Adrian has $21 to spend on energy drinks and protein bars and wants to maximize his utility on his purchase. Based on the data in the table, how many energy drinks and protein bars should Adrian purchase, and what is his total utility from the purchase? Does the utility-maximizing rule hold true for his purchase? Explain. 

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Energy Drinks $3.00 Quantity 1 2 3 4 MU 84 72 60 48 TU 84 156 216 264 Protein Bars $1.50 Quantity 1 2 3 4 MU 36 30 24 18 TU 36 66 90 108