My patio has an area of 68 m , so 48m2.
Each tile has an area of 0.50.5 m, so 0.25m2.
To find the number of tiles we need, we divide the area of the patio by the area of one tile:
48/0.25 = 192 tiles
Each tile costs £1.50, so the overall cost in pounds is:
192*1.50 = £288.00