Number of students in institute A & B were in the ratio of 7 : 15 respectively in 2012. In 2013 the number of students in institute A increased by 25% and the number of students in institute B increased by 26%, then what was the respective ratio between number of students in institute A & B respectively in 2013?
1)25 : 54 2)24 : 55 3)24 : 53 4)25 : 53 5)25 : 56