$$1/10((-75)/600)+1$$
$\frac{79}{80}=0.9875$
$$\frac{1}{10}\left(-\frac{1}{8}\right)+1$$
$$\frac{1\left(-1\right)}{10\times 8}+1$$
$$\frac{-1}{80}+1$$
$$-\frac{1}{80}+1$$
$$-\frac{1}{80}+\frac{80}{80}$$
$$\frac{-1+80}{80}$$
$$\frac{79}{80}$$
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$\frac{79}{2 ^ {4} \cdot 5} = 0.9875$