A hybrid mango tree, whose life span is 10 years starts giving fruits from the first year onwards. In the nth year it produces 11n raw mangoes. But during the first half of the tree's life, every year,a certain number, which is constant, fail to ripen into fruits. During the second half of the trees life, every year,the number of raw fruits that fail to ripen is half the corresponding number in the first half of the tree's life. In the fourth year of the tree life, it produces 36 ripe mangoes. How many man-goes ripen during the 9th year of the tree's life?