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. 7 T2 X& t. Z' z" W& x- ` * X: L7 R7 G, ^- O% E# A# OThis is just rough idea.