I have planned my book to be around 250 pages. Because that is my target audience. In my country I can sell the book of that length for around 250-300 rupees. (*Its just my plan, I don't know yet how will it work out in reality). I have finished 80 pages which is the complete rough draft of my book. My ending is reached, now I am just going to fill in the blanks with major plots. Its still a meaningful writing.
How should I design length of a chapter. If I decide that each chapter should be around 20 pages then the story gets broken and shifted to next chapter. If I plan according to the story then one chapter has become 21 pages and another is 35 pages, which is extremely unsymmetrical. So my question is how and where to end the chapters?