There are 34 questions on a test. john answers 22 of them correctly. what is john's percentage error?

35.29%

Explanation:

no. of questions in test = 34

no. of questions answered correctly = 22

therefore, no. of questions answered incorrectly = 34 - 22

                                                                                 = 12

error percentage = 12/34 * 100

                             = 35.29%