Normally, stairway $5.00 per step, floor $5.00 per sqaure yard. As the carpeter itself depening the quality you like. Also, for the floor footage, you need add roughly 10% extra as you need to cut and through some carpeter. 5 y0 G7 L3 g2 H+ n8 k4 i* T4 Q; E, _& I; z2 a$ U( x
This is just rough idea.