Answer
$$a) $889.80 $$
$$b) $977$$
Work Step by Step
$$a) 87.20 \times \frac{100}{9.8}=889.7959184\approx$889.80 $$
$$b)87.20 \times \frac{100}{9.8}\times\frac{109.8}{100}=976.9959184\approx $977$$
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