$$= \frac { 2000 - 18200 } { 18200 } \times 100$$
$-\frac{8100}{91}\approx -89.010989011$
$$\frac{-16200}{18200}\times 100$$
$$-\frac{81}{91}\times 100$$
$$\frac{-81\times 100}{91}$$
$$\frac{-8100}{91}$$
$$-\frac{8100}{91}$$
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$-\frac{8100}{91} = -89\frac{1}{91} = -89.01098901098901$
