Normally, stairway $5.00 per step, floor $5.00 per sqaure yard. As the carpeter itself depening the quality you like. Also, for the floor footage, you need add roughly 10% extra as you need to cut and through some carpeter. ( S* \: x; \( m; |2 k- |3 \; ^" ~. a" _2 y; C. c' R# m$ W
This is just rough idea.