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In a bakery, there were a total of 900 cakes and cookies.
70% of them were cakes. After some of the items were sold, the number of cakes decreased by 20%.
In the end, 10% of the items in the bakery are cookies.
(a) How many cookies were sold in all?
(b) If the selling price of a cookie is $1.50 a piece, how much was collected from the sale of the cookies?
Notes to students: