$$\frac { 18000 - 1400 } { 1400 } \times 100 \%$$
$\frac{83}{7}\approx 11.857142857$
$$\frac{18000-1400}{1400}\times 1$$
$$\frac{16600}{1400}\times 1$$
$$\frac{83}{7}\times 1$$
$$\frac{83}{7}$$
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$\frac{83}{7} = 11\frac{6}{7} = 11.857142857142858$
