Answer:
6734
Explanation:
1st month -> 486
2nd month->(1/3 x 486)+ 486
=648
3rd month->(1/3 x 648)+ 648
=864
4th month->(1/3 x 864)+ 864
=1152
5th month ->(1/3 x 1152)+ 1152
=1536
6th month ->(1/3 x 1536)+ 1536
=2048
486 + 648 + 864 + 1152 + 1536 +2048 = 6734