
Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion 
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July 18th, 2019, 06:57 AM  #1 
Senior Member Joined: Aug 2014 From: India Posts: 458 Thanks: 1  Still I should Amount as 7200?
Rs 6000 becomes Rs 7200 in 4 years. If the rate becomes 1.5 times of itself, the amount of the same principal in 5 years will be: Sol: Amount = 7200; S.I = A – P; S.I = 7200 6000 = 1200. → 1200 = 6000*R*4/100 → R = 5% Now R is increased upto 1.5 times, i.e 7.50% Now S.I = 6000*7.50/100*5; S.I = 2250. Amount = P + S.I = 6000 + 2250 = 8250 If I change question like this: Rs 6000 becomes Rs 7200 in 4 years. If the rate becomes 1.5 times of itself, the S.I of the same principal in 5 years will be: Still I should Amount as 7200? 
July 18th, 2019, 07:12 AM  #2 
Senior Member Joined: Jun 2019 From: USA Posts: 120 Thanks: 40 
Absolutely nothing has changed in the new scenario. SI = Rs 2250.

July 18th, 2019, 07:14 AM  #3 
Senior Member Joined: Aug 2014 From: India Posts: 458 Thanks: 1  
July 18th, 2019, 08:27 AM  #4 
Global Moderator Joined: Dec 2006 Posts: 20,921 Thanks: 2203 
We can't guarantee that every textbook or author uses the same terminology. The original question is ambiguous for a different reason  it isn't entirely clear whether the fiveyear period is instead of the fouryear period or whether it starts when the fouryear period ends, though the first of these possibilities is likely to be the intended interpretation. 
July 18th, 2019, 11:49 PM  #5 
Senior Member Joined: Apr 2014 From: UK Posts: 953 Thanks: 340 
The use of the word 'amount' is confusing, you have it as 7200 and 8250, you need to define it a little more. 'initial amount' and 'final amount' would be much better terminology.


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