Final answer:
Uncle Oelbermann became a millionaire through smart business investments and operating a successful wholesale toy store, further enhancing his wealth by investing lottery winnings at a six percent interest rate.
Step-by-step explanation:
Uncle Oelbermann became a millionaire by being a prudent businessperson. He invested the winnings from a lottery ticket, secured a six percent interest rate, and contributed to his wealth by operating his wholesale toy store. Uncle Oelbermann is described as a person of few words, but through his actions and strategic financial dealings, notably with Trina's lottery winnings, he demonstrated a keen sense for business and investment that ultimately led him to his wealth.