Kraus Steel Company has two departments, Casting and Rolling. In the Rolling Department, ingots from the Casting Department are rolled into steel sheet. The Rolling Department received $54,900$ tons from the Casting Department in October. During October, the Rolling Department completed $60,600$ tons, including $7,900$ tons of work in process on October $1.$ The ending work in process inventory on October $31$ was $2,200$ tons.

How many tons were started and completed during October?

fill in the blank $1$ tons