The score would be 56%
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30
20-3 = 17 and 17/20 = 85/100 = .85 or 85%. Percent is a ratio per cent or 100. Multiplying both the 20 and the 17 by 5 will make the denominator 100 and the percent sought after.
Assuming that each question carries the same one mark: 88% right = 100% - 88 % wrong = 12 % wrong → 12 % of 44 = 12/100 × 44 = 5.28 wrong Assuming that your percentage right was truncated (and not rounded to 89% to the nearest whole number), you got 5 wrong.
To get at least 64% you can miss at most 100 - 64 % = 36 % Percent means "out of 100" 36 % of 56 = 36/100 x 56 = 20.16 → Can miss 20 questions.
[(100x60) + (Tx40)]/100=Average, where T is you average on the other 40% of your grade. Example: your grade average is 90 before the test. You get a 100 on the big test. [(100x60) + 90x40)]/100 = [6000 + 3600]/100 = 96