Mr. a. turn on the fan at 20.00 pm and scheduled to blow off at 23.00 hrs Mr. b. itself started off blows down with Mr. g, but closed at 6.00 p.m., fans of the next day. If both fans use 150 watts of power and electricity supply of baht 2.00 per unit, Mr. a. will save electricity and more. Mr. b. This is the money a few baht.
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