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. 4 `2 X0 G+ t% q/ a9 f/ m9 ]# S6 A+ R1 M" N) R
This is just rough idea.