Hydrocarbons Part 2

The cycloalkene ( X ) on bromination consumes one mole of bromine per mole of ( X ) and gives the product (Y) in which C:Br ratio is 3:1. The percentage of bromine in the product (Y) is ____ \%. (Nearest integer)
(Given : molar mass in gmol−1H:1,C:12,O:16,Br:80 )