HRA Exemption and Housing Loan Interest

Thanks Mr. Eswar Reddy.  

1. HRA Exemption : My employer paid HRA in the months of Apr, May & Jun and I stayed in rented house.  From Jul onwards, NO HRA paid by employer and I am staying in my own house.  In this case, how much basic amount should I consider for HRA exemption calculation?  3 months basic only or entire year basic?

2) HOUSING LOAN INTEREST : Myself and my spouse invested 50% each at the time of purchase of flat 4 yrs ago.  So far, out of the total interest paid towards housing loan, we have been sharing 50% each.  This year, my spouse's income is not attracting income tax.  Hence, can I consider entire amount of interest for my tax exemption calculation or about 70 to 75% of the interest paid?