
Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion 
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July 28th, 2019, 07:36 AM  #1 
Senior Member Joined: Aug 2014 From: India Posts: 458 Thanks: 1  Why second initial value taken as 10 instead of 100?
Rohan purchased a bike for Rs 54000. He sold it at a loss of 8%. With that money he again purchased another bike and sold it at a profit of10%. what is his overall loss/ profit? Sol: 1000 = 54000 1 = 54. 12 = 12*54 = 648 Why second initial value taken as 10 instead of 100? 
July 28th, 2019, 11:40 AM  #2 
Math Team Joined: May 2013 From: The Astral plane Posts: 2,257 Thanks: 927 Math Focus: Wibbly wobbly timeywimey stuff.  
July 28th, 2019, 11:38 PM  #3 
Senior Member Joined: Apr 2014 From: UK Posts: 953 Thanks: 340 
I hate these stupid shortcuts, unless you know exactly how they work, and can remember them, one mistake and you have no hope of finding where you went wrong. Learn to do the maths properly, it's a lot less to remember!

July 29th, 2019, 03:44 AM  #4 
Senior Member Joined: Aug 2014 From: India Posts: 458 Thanks: 1  In Indian maths, shortcut & final answer matters. how they work doesn't matter.

July 29th, 2019, 05:16 AM  #5 
Senior Member Joined: Feb 2016 From: Australia Posts: 1,834 Thanks: 649 Math Focus: Yet to find out.  
July 29th, 2019, 11:28 PM  #6 
Senior Member Joined: Apr 2014 From: UK Posts: 953 Thanks: 340 
How they work absolutely matters if you want to be able to use them, which is why you're here isn't it? If you knew how the shortcut worked you'd be able to do it. But, that isn't what I was trying to say. If you can do the actual maths then all of these problems become much easier as you don't need to remember how to use any of the shortcuts, you simply don't use them! It also means you can do maths problems that you don't know the shortcut for. 

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