Calculate the weighted $-$average cist of the cullumber Inc. for the month ended october $31,2025.$ Cullumber yses a periodic system inventory $.$ Oct $1,$ beginning inventory units $65,$ unit cost or sellingprice $$26$ and oct $9$ purchase $130$ units, $$28$ units cost or selling price, and october $11,$ sale $100$ units, $$45$ unit cost or selling