铺瓷砖的面积:70*2*2+50*2*2+50*70=3980㎡
单块瓷砖面积:0.2*0.2=0.04㎡
瓷砖块数:3980/00.4=99500块
路池面积:(70+2.4)*(50+2.4)=3793.76㎡