Aptitude - Decimal Fraction - Discussion

40 paise converted to rupees as 0.40 . each year x increase 0.4 and each year Y increase 0.15 so,
Year ---------------> X ----- Y
2001 ------------ 4.2 ----- 6.3
2002 ------------4.6 ----- 6.45
2003 ------------5 ----- 6.6
2004 ------------5.4 ----- 6.75
2005 ------------5.8 ----- 6.9
2006 ------------6.2 ----- 7.05
2007 ------------6.6 ----- 7.2
2008 ------------7 ----- 7.35
2009 ------------7.4 -----7.5
2010 ------------ 7.8 -----7.65
2011 ------------8.2 ----- 7.8

Convert it into rupees
X Y
820 780
their difference (820-780)=40.
therefore ans is 2011.

Hey guys there is a very easy trick to solve such type of problems.

Now take y as constant at 6.30 and see the difference in the increase i.e., 40-15=25.

Now increase .25 into 4.20 till it reaches near 6.30. so, in 2010 it reaches to 6.45.

Now, in 2011 increase as given in the question.

As .15 into 6.30 = 6.45 and .40 into 6.45 = 6.85 in 2011 so, .40 increased in 2011.

Logic - 40 ps * 10 yrs = 4 Rs (Rs 4.20 + Rs 4) = 8.20 Rs.

15 ps * 10 yrs = 1.50 Rs/Ps (Rs 6.30 + Rs 1.50)= 7.80 Rs.

8.20 - 7.80 = 40ps.

yr 2001
10 yrs
----
yr 2011 Answer.
----

Hey, the logic what you mentioned here is right but when I'm calculating by year to year basis the answer found to be as 2013.

But your answer is 2011. How?

I solved by using arithmetic progression.

4.20+(n-1)0.40 = 6.30+(n-1)0.15 + 0.40.

And the answer which came is 11 i.e 2012.

a+(n-1)d = arithmetic progression
4.20+(n-1).40 = 6.30+(n-1).15 + .0
n-1 = 10;
n =11;
check the result..is it correct?

I did not understand this problem. So I want to know detail about this. Some one help me out please.

420 + 40x = 630 + 15x + 40.
420 + 40x = 670 + 15x,
25x=250,
x = 10years.
2001 + 10 = 2011.

Why calculate using 0.40 as the increase after time z and 40 as given in the question?

In 2011 x commodity will be 8.20 &y will be 7.95 i.e 0.35 paise more than y.....