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. 2 f, u9 k/ y! n; b3 V) e! I9 L2 m+ T
This is just rough idea.