P sells a product to Q and makes a profit of 25%. Q sells it to R at a loss of 20%. If R buys it for Tk. 140, what price did p pay for it?

P sells a product to Q and makes a profit of 25%. Q sells it to R at a loss of 20%. If R buys it for Tk. 140, what price did p pay for it? Correct Answer 140

Let,  Buying price x taka ATQ,  (x of 125%) of 80% =  140⇒ x×125100×80100 = 140⇒ x×10001000 = 140.:. x =  140
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একজন চাকরিজীবীর আয় ও ব্যয়ের অনুপার ২০ঃ ১৫ হলে, তার মাসিক সঞ্চয় আয়ের শতকরা কত অংশ?
একটি ট্রান্সফরমারের প্রাইমারি ও সেকেন্ডারি তারের ঘূর্ণনের অনুপাত 20ঃ 1 এবং সেকেন্ডারিতে 20 omega রোধ লাগানো আছে। যদি প্রাইমারিতে 220 V প্রয়োগ করা হয় তাহলে এর মধ্যে বিদ্যুৎ প্রবাহ হবে-