My Math Forum Still I should Amount as 7200?

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

 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
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Quote:
 Originally Posted by DarnItJimImAnEngineer Absolutely nothing has changed in the new scenario. SI = Rs 2250.
Something 1 becomes Something 2.

Something 2 always taken as amount in S.I problems?

 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 five-year period is instead of the four-year period or whether it starts when the four-year 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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