Yesterday, his shop washed 5 + 5 = <<5+5=10>>10 kilos of laundry.
Today, it washed 2 x 10 = <<2*10=20>>20 kilos of laundry.
Thus, Oliver's shop washed a total of 5 + 10 + 20 = <<5+10+20=35>>35 kilos of laundries for three days.
Therefore, his shop earned 35 x $2 = $<<35*2=70>>70 for three days.
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