A lady works to fulfill the needs of people, and she has a case of a needy family who have a refrigerator that has been repaired multiple times. This lady asked charitable people to buy them a refrigerator on installments. She has been in trade for a long time. Is it permissible for her to buy the refrigerator herself and sell it to the needy family on installments, and of course, she takes the installments, or should she take a loan from the benevolent loan fund without interest, and the installments should be paid to the fund?