单选题 There were 36,000 hardback copies of a certain novel sold before the paperback version was issued. From the time the first paperback copy was sold until the last copy of the novel was sold, 9 times as many paperback copies as hardback copies were sold, if a total of 441, 000 copies of the novel were sold in all, how many paperback copies were sold?
(A) 45,000 (B) 360,000
(C) 364,500 (D) 392,000
(E) 396,900

【正确答案】 C
【答案解析】[解析] 设简装本的销售量为x,则根据题意可列出如下方程: