The pie chart given below gives the measures of the central angles of the sectors that reflect the number of flats in 6 different towers in a housing society with respect to the total flats in these 6 towers taken together.
If the difference between the number of flats in T2 and in T6 is 66, then what is the total number of flats in the 6 towers taken together?
1
1140
2
960
3
1220
4
1080