Tiles, tiler and tile Prices

As we have 5 bathrooms and tiled the kitchen floor and entrance hall there was a considerable quantity and cost of tiles we sourced the tiles from three different shops:-
Kitchen floor tiles, right price tiles €5.99 a yard
Entrance hall tiles and main bathroom marble and limestone €20.99 each from Irwins Castleblaney
All other wall and floor tiles BTW waterford during sale €12.99 - €24.99
Total cost of tiles was €4,950
The tiler priced the job at €22a yard for marble and €14 a yard for ceramics, his total cost was €3,400 although he did try to argue that he had meant to tell me his price was €4,300!!!! There was €1,200 on materials on top of this grout seals and adhesive!
Total cost materials and labour €9,550