Income of 'Y' is 20/27 than that of 'X' and the income of 'Z' is Rs.2000 less than that of 'Y'. 'X' spent 25% of his income and saved the rest, while 'Y' spent Rs. 2400 less than what he saved such that the ratio of expenditure of 'X' and 'Y' is 3 : 4 respectively if 'Z' saves Rs.13600 then how much amount does he spent?