Normally, stairway $5.00 per step, floor $5.00 per sqaure yard. As the carpeter itself depening the quality you like. Also, for the floor footage, you need add roughly 10% extra as you need to cut and through some carpeter. 0 Q+ w8 a) o/ B9 }) w7 e' f% s M5 Q6 R! L) I$ x2 ~
This is just rough idea.