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. ' X8 Q, x ?/ U& @& O8 \% r- ?7 k* p" Q
This is just rough idea.