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If you take the pitch into account, the dimension is roughly 16 on each slope. Multiplied by 50, the area works out to 1600 SF or 16 square, a term used for measurement of roofing and siding: an area of 100 SF. Ordinary 3-tab shingles cover 3 bundles to a square, or you need 53.33 bundles, assuming no waste. Break on half is the ordinary convention and will bring you to ~57 bundles. Depending on rainfall amounts, I like break on third for the greater distribution of tab rain paths. It is a touch more effort, but I prefer the look. At ~$8/bundle, having a few extra isn't a killer. Put your money into 30# felt, and use a self-adhering bituminous membrane at edges, valleys, and abutments. Grace Ice and Water Dam is one brand. Pricey, but worth the cost. Good luck.
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There ain't nothin' more powerful than the odor of mendacity -Big Daddy
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