Updated Version. If the average prices of eight biology books, four medical books and twelve math books are $80,$140 and $100 respectively, what is the average price of all twenty four books ? #SATprep, #ACTprep, #PSATprep. Note. There is at least one way to solve this problem in 10 seconds after you read the question. If you are able to solve this in 10 or 15 seconds after reading the questions, please your method, answer the time you took to get your answer.
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