2 wrong is 15 right, out of 17
then 15/17 = over 88%
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17/20, 85%
(2/30)*100 =6.666666666666667% wrong
2 wrong out of 12 test would be either a A or B b which its good for several students
88% or B+
The answer is 100 (17/85) = 20 %. More information below. Actually if you got 17 incorrect answers, then you didn't do too badly. 85 -17 = 68 So 68 /85 = 80% You got 80% on your test