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Earlier discussion
1 older comment kept for context.
Oluwaseun Adeyemi
He pays tax on 1 - \(\frac{7}{8}\) = \(\frac{1}{7}\)th of his income
20% is 490, 100% is \(\frac{1000}{20}\) x 490, ₦2,450.00
= \(\frac{7}{8}\) of his income = ₦2,450.00
\(\frac{1}{\frac{7}{8}}\) x 2450
= \(\frac{8 \times 2450}{7}\)
= \(\frac{19600}{7}\)
= ₦2800.00