In an examination passing percentage is 40. A obtained 80 out of 400. By what percent did he fail?
Explanation:
Passing marks = 40% of 400 = 160
He obtained 80, i.e. he failed by (160 - 80=) 80 marks.
Percentage by which he failed = 80400 × 100 = 20%
Hence, option (d).
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