After getting an A on your economics exam, you decide to go to your favourite Mexican restaurant to celebrate. You are having trouble deciding whether to order the chipotle chicken chimichanga or the cilantro seafood enchiladas. Use the rule of equal marginal utility per dollar to determine which one to purchase: (a) the chimichanga for $8 which gives you 120 units of utility, or (b) the enchiladas for $15 which gives you 195 units of utility?