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 Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion

 July 30th, 2019, 07:31 AM #1 Senior Member   Joined: Aug 2014 From: India Posts: 476 Thanks: 1 How profit% equation obtained? Even after reducing the marked price of a transistor by Rs 32, a shopkeeper makes a profit of 15%. If the C.P be Rs 320., what % of profit would he have made if he had sold the transistor at M.P? Solution: profit% = 32/320*100 = 10% total profit = 15+10 = 25. How profit% equation obtained? Last edited by skipjack; July 30th, 2019 at 09:39 AM. July 30th, 2019, 09:51 AM #2 Global Moderator   Joined: Dec 2006 Posts: 21,028 Thanks: 2259 The profit, as a percentage of the C.P., is (S.P. - C.P.)/C.P.×100%, so if the S.P. changes by an amount r, that percentage changes by (S.P.+ r - C.P.)/C.P.×100% - (S.P. - C.P.)/C.P.×100% = r/C.P.×100%, which is 32/320×100% for the change described. July 30th, 2019, 11:14 PM #3 Senior Member   Joined: Aug 2014 From: India Posts: 476 Thanks: 1 How can you tell given question contains S.P. changes by an amount r? In the question, nowhere mentioned about S.P. There are two sentences in the question, how can you tell CP is 320 in both sentences? Last edited by Ganesh Ujwal; July 30th, 2019 at 11:25 PM. Tags equation, obtained, profit% Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Similar Threads Thread Thread Starter Forum Replies Last Post Ganesh Ujwal Elementary Math 9 July 2nd, 2018 10:10 AM Ganesh Ujwal Elementary Math 12 June 19th, 2018 03:52 AM Ganesh Ujwal Elementary Math 9 May 3rd, 2018 09:26 AM Ganesh Ujwal Elementary Math 1 April 19th, 2018 01:09 AM mathkid Calculus 4 September 24th, 2012 08:35 PM

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