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or, T=1.8 years.
=1 year +0.8 years.
=1 year + 8/10*365 days
=1 year and 292 days.
The required date will be 1 year and 292 days later 5th Jan 2011.
The next year is 2012 .
Note that the number of days (in total) is 365+292=657 but here we will take 658 days into account since a leap year has 1 extra day.
The required date=(30-5)+31+31+30+31+30+31+31+29+31+30+31+30+31+31+30+31+30+31+31+28+(31-7) By trial and error method is 24th March 2013.
2.Let the rate be x%.
1st case:
P=Rs.2400 ,T=3 y , R=x% 
2nd case:
P=Rs.2000 ,T=3y , R=x%
Given , 72x-60x=60.
Ans:The rate is 5% p.a.

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