Kalim is asked to write a study guide for a textbook. For his work, the publishing company is giving him a choice of a one-time payment of Tk 13,375 or Tk 2,000 plus 10% royalties per copy sold. If the proposed royalty rate results in a royalty of Tk 3.25 per study guide sold, how many study guides need to be sold for the total income received by Kalim to be the same from either choice?
Explanation: পাবলিশিং কোম্পানি থেকে আয় এককালীন \(13,375\) টাকা। ধরি, Kalim 'x' টি বই বিক্রি করে যখন দুই পদ্ধতিতেই তার আয় \(13,375\) টাকা। সুতরাং \(13375 = 2000 + 3.25x\)। Or, \(3.25x = 11375\)। Or, \(x = \frac{11375}{3.25}\)। Or, \(x = 3500\).
