unrealised rent recovered

MR. p Mishra owns a house property which is given on rent ,for the previous year 2015-16 he claims a deduction of 50000 on ACCOUNT of unrealised rent out of which the assessing officer allows only 42000 as deduction .On 10 Aug 2016 Mr Mishra recover some money from default tenant as full and final payment .how much amount will be taxable out of recovered amount if (a) recovered amount is 6000 (expense of recovery 1000) (b) recovered amount is 10000 (expanse of recovery 30000)