A machine produces 4500 parts in an 8 hour day. In minutes, how long will it take to produce 100 parts?

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Bismuth-210 is an isotope that radioactively decays by about 13% each day, meaning 13% of the remaining bismuth-210 transforms into another atom (polonium-210 in this case) each day. if you begin with 233 mg of bismuth-210, how much remains after 8 days?

If 25% of y is 30, what is 60% of y?