In a continuous countercurrent extractor, $4500kg$ of cotton seeds $(17\mathrm{.}5$ mass percent oil,

$77\mathrm{.}5$ mass percent inert solid, and $5$ mass percent hexane$)$ must be extracted daily using a

fresh solvent mixture that comprises $2175kg$ hexane and $35kg$ oil. There should be $85kg$

of oil in the leached solids. The information is provided below.

Calculate $,{?}^0,Y_N$ and $x_1$

Calculate the V$1$ and the number of stages $($Please solve by drawing a graph$)$

$3.$Calculate the percent recovery