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The electric heating fee of a house consists of two parts. The fixed fee to be paid each month is [[$ 15 $]] QAR, and the consumption fee is [[$ 0.04 $]] QAR per kilowatt hour. The monthly consumption is [[$ 2,500 $]] kWh. Both fees are increased by [[$ 5 $]]%. What percentage of consumption must be reduced if the cost is to be kept the same?
Answer: Consumption must be reduced by [[$ \% $]].
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