Long description

The total area of the patio to be covered = 4 m × 3 m = 12 square metres

Area of each slab = 0.5 m × 0.5 m = 0.25 square metres

So the number of slabs needed = 12 ÷ 0.25 = 48

But purchase 50 slabs to allow for cuts and mistakes

Then the total cost of 50 slabs at £6 each = 50 × £6 = £300

Therefore, the total cost of the slabs is £300.