$$77\frac{1}{2}\times4\frac{1}{\xi}$$
$\frac{310}{\xi }$
$$\frac{154+1}{2}\times 4\times \frac{1}{\xi }$$
$$\frac{155}{2}\times 4\times \frac{1}{\xi }$$
$$\frac{155\times 4}{2}\times \frac{1}{\xi }$$
$$\frac{620}{2}\times \frac{1}{\xi }$$
$$310\times \frac{1}{\xi }$$
$$\frac{310}{\xi }$$
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