Apply 6. Julian is going to build a birdhouse. The back of the birdhouse has the dimensions shown. If wood costs $0.17 per square inch, what is the least he will spend on the back of the bird house? Round to the nearest hundredth if necessary. 7. William's father wants to buy a new glass top for the desk in his home office. The dimensions of the top of the desk are shown. If glass is $0.06 per square inch, how much will the new glass top cost for his desk? Round to the nearest hundredth if necessary. 14in. 8 in. 8 in. 48 in. 20 in. 32 in. 16 in. 14 in. 14 in.