 
<translate> Tụgharịa ajụjụ, zaa di na nwunye site na nkọwa a: Ihe dị n'elu ụgbọ ahụ bụ 30 * 40 = 1200 square ụkwụ. Ọ na-akwụ 3 + 1 = $4 kwa square ụkwụ. Ya mere, ọ kwụrụ 1200 * 4 = $4800. <eng> Reconstruct a question, answer pair from this explanation: The deck is 30 * 40 = 1200 square feet. He pays 3 + 1 = $4 per square foot. So he paid 1200 * 4 = $4800.
 