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A loan helped to buy dental materials to sell.
The loan that she is requesting is to purchase dental materials to sell. With time, she has learned much about these products and is quite sure she can make a profit selling them.
Nieves is an enthusiastic saleswoman who was in the grocery selling business (e.g. rice, sugar, noodles). She is now concentrating her efforts in the dental material selling business, which is why she is asking for a loan.