 
<translate> Ulo 10 mbụ bụ 10 * 12 = 120 ụkwụ. E nwere 20 fọdụrụ - 10 = 10 akụkọ. Nke ọ bụla n'ime ha dị 12+3=15 ụkwụ. Ya mere, akụkọ ndị ahụ bụ 15 * 10 = 150 ụkwụ. Ya mere, ngụkọta elu bụ 120 + 150 = 270 ụkwụ. Azịza ikpeazụ ya bụ: 270. <eng> The first 10 floors are 10 * 12 = 120 feet. There are a remaining 20 - 10 = 10 stories. They are each 12 + 3 = 15 feet. So those stories are 15 * 10 = 150 feet. So the total height is 120 + 150 = 270 feet. The final answer: 270. 