In an effort to make room for new inventory, a college bookstore runs a sale on its least popular mathematics books. The sales rate (books sold per day) on day t of the sale is predicted to be 60/t (for  t ≥ 1),  where  t = 1  corresponds to the beginning of the sale, at which time none of the inventory of 370 books had been sold. (a) Find a formula for the number of books sold up to day t. S(t) =

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