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To calculate the energy usage in kilowatt-hours (kWh) for the laundromat, we need to consider the power consumption of each washer, the daily usage, and the total number of days. Here's the calculation:

Power consumption of one washer = 1200 W Daily usage per washer = 10 hours

Total power consumed per washer per day = Power consumption × Daily usage = 1200 W × 10 hours = 12,000 watt-hours (Wh) = 12 kWh

Number of washers = 8 Number of operating days = 6

Total energy consumed by all washers in a week = Total power consumed per washer per day × Number of washers × Number of operating days = 12 kWh × 8 × 6 = 576 kWh

Therefore, the laundromat with eight washers, each using 1200 W, and operating 10 hours a day for a 6-day week will consume a total of 576 kilowatt-hours (kWh) of energy in that week.

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