 
 <translate> The volume of the slab is 100 * 100 * .5 = 5000 cubic feet. So it weighs 5000 * 150 = 750000 pounds. That means the cost is 750000 * $0.02 = $15,000 per house. So the total cost for all 3 houses is $15000 * 3 = $45,000.
Thus, the answer is 45000. <hau> Girman slab din shine 100 * 100 *.5 = 5000 ƙafafun ƙafa. Saboda haka nauyinsa ya kai fam dubu biyar da ɗari biyar da hamsin da biyar, wato fam dubu bakwai da dubu hamsin da biyar. Wannan yana nufin kudin 750000 * $0.02 = $15,000 da gida. Saboda haka jimillar kudin gidaje 3 shine $15000 * 3 = $45,000. Saboda haka, amsar ita ce 45000. 