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. , B# t: \$ j% x9 d( U3 W! M5 F6 c1 \3 x; O5 g" r
This is just rough idea.