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. ( I; g' \' C. C O1 k P0 Y6 G& }3 i! T5 ^- F- q: L* f
This is just rough idea.