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Step-by-step explanation:
[tex](a) \: \: \: \: \frac{1}{8} \times 100[/tex]
[tex] = \frac{1}{4} \times 50[/tex]
[tex] = \frac{1}{2} \times 25[/tex]
[tex] = \frac{25}{2} [/tex]
[tex] = 12.5\%[/tex]
[tex](b) \: \: \: \: \: \frac{5}{4} \times 100[/tex]
[tex] = \frac{5}{2} \times 50[/tex]
[tex] = \frac{250}{2} [/tex]
[tex] = 125\%[/tex]
[tex](c) \: \: \: \: \: \frac{3}{40} \times 100[/tex]
[tex] = \frac{3}{4} \times 10[/tex]
[tex] = \frac{3}{2} \times 5[/tex]
[tex] = \frac{15}{2} [/tex]
[tex] = 7.5\%[/tex]
[tex](d) \: \: \: \: \frac{2}{7} \times 100[/tex]
[tex] = \frac{200}{7} [/tex]
[tex] = 28.57\%[/tex]