Capital gain confusion

N@12345 (CA Job) (26 Points)

20 September 2015  

An Assessee bought a plot in August 2001 for 3Lacs

Sold half of it in August 2011 for 15Lacs

Invested 15Lacs on construction of new house on the other half plot

Sold the other half plot+constructed part for 20L in August 2013

What will be tax impact in AY 2012-13 and AY 2014-15