(A) Given that $20 \%$ of $a = b$.This can be written as $\frac{20}{100} \times a = b$,which simplifies to $0.2a = b$.We need to find $b \%$ of $20$.S

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(A) Given that $20 \%$ of $a = b$.This can be written as $\frac{20}{100} \times a = b$,which simplifies to $0.2a = b$.We need to find $b \%$ of $20$.Substituting $b = 0.2a$ into the expression:$b \%$ of $20 = \frac{b}{100} \times 20 = \frac{0.2a}{100} \times 20$.$= \frac{0.2 \times 20}{100} \times a = \frac{4}{100} \times a$.$= 4 \%$ of $a$.