$4500kg$ per day of cotton seeds mass $\%$ of oil, $79,5$ mass $\%$ inert solid, and $4$ muss $\%$ hexane$)$ is to be extracted with fresh solvent mixture contains $2150kg$ hexane and $25kg$ oil in a continous counter current extractor. The leached solids are to contain $108kg$ oil. The data are givenibelow

$\backslash$table$[[y,0,0,1,0,2,0,3,0,4,0,5,0,6,0,7],[N,2,1,94,1,92,1,85,1,8,1,7,1,62,1,55]]$

a$)$ Determine $Na$

b$)$ Calculate $y_N$

c$)$ Calculate $x_1$

d$)$ Calculate LN

e$)$ Determine mixed steam $($M$)$ and its composition $(x_{AM})$

f$)$ Calculate $V_1$

g$)$ Calculate the number of stages

Please explain in great detail.