Of the 20 available cars for rent, 12 are automatic cars, 4 are manual cars, and the rest are semi-automatic. What percentage of the cars are semi-automatic?
12 + 4 = <<12+4=16>>16 cars are either automatic or manual.
So, 20 - 16 = <<20-16=4>>4 cars are semi-automatic.
Therefore, the percentage of semi-automatic cars is 4/20 x 100% = 20%.
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