The supermarket has 15 cases × 24 tins/case = <<15*24=360>>360 tins of beans delivered to them.
There are 360 tins × 0.05 = <<360*0.05=18>>18 tins that are damaged and unsellable.
So in the end, there are 360 tins - 18 tins = <<360-18=342>>342 tins of beans that are left.
#### 342