Alexandra bought 8 magazines at the bookstore on Friday. On Saturday, she went back and bought 12 more. Sunday morning, she saw that the store was having a sale and she bought four times the number of magazines she did on Friday. Later that day she discovered that her dog had chewed up 4 of the magazines. How many magazines does she have now? Give me reasons, before answering the question

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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By adding Friday and Saturday, Alexandra bought 12 + 8 = 20 magazines. On Sunday she buys 8 * 4 = 32 magazines. Before her dog got to them she had 12 + 8 + 32 = 52 magazines. After her dog chewed up some she had 52 - 4 = 48 magazines. So the final answer is 48.