Normally, stairway $5.00 per step, floor $5.00 per sqaure yard. As the carpeter itself depening the quality you like. Also, for the floor footage, you need add roughly 10% extra as you need to cut and through some carpeter. 2 S2 O4 m" {! u$ _ y" f$ r: {% M2 C, a$ [- ?
This is just rough idea.