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 P: 83 looks good to me. Although if I were to give advice, I would say don't try to memorize those kinds of formulas. Instead, try to remember a method for setting these types of problems up. Usually this involves some form of considering a small "slice" of water of width $\Delta x$ and finding the small amount of work $\Delta W$ and then summing up over the entire volume of the water. this method might seem tedious for simple problems, but it might give you a better understanding of what is really going on here.