Hydrostatic force on a dam

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A dam is inclined at an angle of 30° from the vertical and has the shape of an isosceles trapezoid 200 ft wide at the top and 100 ft wide at the bottom and with a slant height of 160 ft. Find the hydro static force on the dam when it is full of water. ( Recall that the weight density of water is 62.5 lb/ft3.) The answer for this question is 83,354,954 lb but I get something else.Any help is appreciated.