If a book published by a publishing house is published at a price of 15 yuan per book, 40000 copies can be published.
每本书籍的定价提高1元可以发行的书的数量就会减少本. 假设最初有$x$本书每本定价为$y$元那么根据题意可以列出以下方程组: $$ \begin{cases} x = 40000 \\ y \cdot (1 + r) = 40000 \cdot (1 + r) + x \end{cases} $$ 其中$r$ 表示每本书的利润率. 将第一个方程式代入第二个方程式中得到: $$ \begin{aligned} y \cdot (1 + r) \cdot (1 + r) &= 40000 \cdot (1 + r) + x \\ y^2 + ry + r^2 &= 40000 + x \\ r &= \frac{1}{2} - \frac{1}{y^2} \\ \end{aligned} $$ 解出 $r$ 的值即可得到每本书的定价 $y$ 的值. 当每本书的定价每提高1元时可以发行的书的数量为: $$ \begin{aligned} x' &= \frac{x - (40000 \cdot (1 + r) + x)}{1 + r} \\ &= \frac{x - 40000 \cdot (1 + r) + x}{1 + r} \\ &= \frac{x}{1 + r} \\ \end{aligned} $$ 因此每本书的定价提高1元时可以发行的书的数量为原来的 $\frac{1}{1 + r}$ 倍.
If I want the chapter where Gu Yu stops being setup and becomes an actual event, which one is it?
Chapter 789, "Son Toad", is the clearest early answer because it turns Gu Yu's situation into a concrete plot event. Early on, Shang Shaojing had given her an envelope containing a piece of paper.... By the end, It was guessed that he was guided by someone else, which led him to....
At what point does "Is He Shameless" become a real turning point for House Mistress?
Look to Chapter 8 for the clearest answer. It begins with The resentment that had barely calmed among the crowd surged back two..., keeps building through Some of them were relatives of the Jiang Family, who felt it improper to..., and lands on Other people with a handsome and charming appearance.
Is Chapter 752 the chapter where the power growth arc finally becomes concrete for Fang Wenzhe?
Chapter 752, "The Sudden and Unforeseen Reversal", is the clearest early answer because it turns Fang Wenzhe's situation into a concrete plot event. A useful checkpoint is the way the scene starts with By what right do you arrest my son?!" Upon hearing the commotion, Mrs.
What chapter-level takeaway best explains why "Gu Pansheng [Extra · Main Character Chapter]" matters for Mom?
Chapter 932, "Gu Pansheng [Extra · Main Character Chapter]", is the clearest early answer because it turns Mom's situation into a concrete plot event.
If someone asks where this storyline really starts moving, would Chapter 753 be your answer?
Chapter 753, "Final Judgment", is the clearest early answer because it turns Fang Wenzhe's situation into a concrete plot event. The chapter gives readers a real answer by opening on In the decade she had been with Fang Wenzhe, Shu Yan never thought...
Where in the first 1000 chapters does Shang Shaojing drive the biggest consequence of "What Kind of In-laws Are They"?
A practical answer is Chapter 2, because it turns the idea into a concrete scene. The chapter opens with On the top floor of the Financial Building, a gathering of dark clouds..., adds pressure through In my opinion, Mother should kick out this troublemaker who's a stranger., and ends on Jiang.
What is the biggest plot change Chapter 932 brings to Auntie?
Chapter 932, "Gu Pansheng [Extra · Main Character Chapter]", is the clearest early answer because it turns Auntie's situation into a concrete plot event. Early on, Gu as in 'Gu Pansheng,' Pan as in 'Gu Pansheng.' I am four years old....
Which chapter is the best bookmark for readers tracking Wen Feifei through the power growth storyline?
Chapter 665, "Give You a Good Lesson on Behalf of Your Mother!", is the clearest early answer because it turns Wen Feifei's situation into a concrete plot event.
If I need a concrete chapter number for Jiang Cheng, is Chapter 729 the strongest early answer?
Chapter 729, "Beauties Often Have Tragic Fates", is the clearest early answer because it turns Jiang Cheng's situation into a concrete plot event. The chapter gives readers a real answer by opening on In the deep of winter, the Capital experienced several heavy...
If I only reread one chapter to remember Are You Worried About Me's situation here, should I pick Chapter 897?
Chapter 897, "Are You Worried About Me?", is the clearest early answer because it turns Wen Jiaojiao's situation into a concrete plot event. The chapter turns that into something concrete by moving from Changqing stood at the roadside with the night breeze blowing,...