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[tex]7 \frac{1}{7} = 7 \ + \frac{1}{7} \\ \\ 7 \: + (1 \: \div 7) \\ \\ 7 \: + 0.142857 \: = 7.142857 \\ \\ 7.142857 \: \times 100 \: = 714.29[/tex]
ANSWER: 7 1/7 = 714.29%
3 ÷ 400 = 0.0075
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0.0075 × 100 = 0.75
ANSWER: 3/400 = 0.75%
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0.0054 × 100 = 0.54
ANSWER: 0.54%