8"x 8"= 64 square unit
16" x 16"= 256 square unit
74" x 128"= 9,742
Divide the 9,742 to 64 and 256
So you will need 148 small square tiles, And 37 big square tiles...
148 x 15= 2,200
37 x 60= 2,200
He can choose any of the tiles because it has the same price....