Solicitudes De Bélgica

I would like to know your prices for the realization of calacata white marble or quartz stair treads Descriptions: 1st staircase: 18 steps including 4 rotating ones 24cm flat foot 18cm tall 90cm wide 2nd stairs: 16 steps a landing 2m long x 1.48 wide 25cm flat foot 17.7cm tall 90cm wide

I am looking for a marble slab for interior and exterior.