Sum of years = 1+2+3+4=10
February 2012~January 2013= (96-6)*(4/10)=$360,000/year
February 2013~January 2014= (96-6)*(3/10)=$270,000 million/year 27/12=$22,500/month
February 2014~January 2015= (96-6)*(2/10)=$180,000/year 18/12=$15,000/month
11 months in 2014=1.5*11=16.5
16.5+2.25=18.75 (million)