Height of the building = 15 m
We know that,
1 m = 100 cm
So, 15 m = 1500 cm
Height of the tower = 8 m 75 cm
8 m 75 cm = 800 cm + 75 cm
= 875 cm
Difference between the heights of the building and the tower
= 15 m - 8 m 75 m
= 1500 cm - 875 cm
= 625 cm or 6 m 25 cm