A company charges $1.25 per lb for a certain fertilizer on all orders 100 lb or less,

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A company charges $1.25 per lb for a certain fertilizer on all orders 100 lb or less, and $1 per lb for orders over 100 lb. Let F(x) represent the cost for buying x lb of the fertilizer. Find the cost of buying the following.
(a) 80 lb 

(b) 150 lb 

(c) 100 lb
(d) Where is F discontinuous?

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