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Property 5.7 yuan electricity fee follow-up

75÷30= 2.5 yuan every day.

2.5÷7= 0.36 yuan per person per day, which has 10 days.

2.5÷6= 0.42 yuan per person for five days per day.

2.5 ÷ 5 = 15 days per person in 0.5 yuan every day.

Check-in 10 days: 0.36× 10=3.6 yuan.

Check-in 15 days: 0.36× 10+0.42×5=5.7 yuan.

The other five people: 0.36×10+0.42× 5+0.5×15. = per person 13.2 yuan.