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The houses on River Road are numbered consecutively from 10 to 132. Each house number is made with brass digits.
#105 would take 3 digits, for example.
1. How many brass digits are needed to form all the house numbers?
2. The numbers can be purchased for $2.29 each or $20.95 per dozen (of the same digit). What is the cheapest combination of numbers that you can arrange?
.: [PREALG], [Aldo Bianchi], [Find the Pattern].