Perpetual inventory using Lipo beginning inventory purchases and sales item follows

July $1$ inventory $100$ units at $$18$

July $8$ Sale $80$ units.

July $15$ purchase $111$ units at $$22$

July $27$ Sale $93$ units.

assuming a perpetual inventory system and using the last$-$in$,$ first$-$ out$($LIFO$)$ method, determine

$($a$)$the cost of July $27$ and

$($b$)$the invrntory on July $31$

a$.$cost of Goods sold on July $27?$

b$.$ inventory on July $31?$