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3. Kamila is baking a cake for the holidays. The hand mixer she is using has a power
rating of 100W.
a) If she uses the mixer for 20 minutes, how much energy was used?
b) She used her oven for another 90 minutes to bake the cake and used 3450W. If it
cost 15.1g/kWh at the time Kamila was baking, what was the cost to prepare the
cake?

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