The end of first hour = 13*3 = 39
The end of second hour = 39*3 = 117
The end of third hour = 117*3 = 351
The end of fourth hour = 351*3 = 1,053
The end of fourth hour = 1053*3 = 3,159
The end of fifth hour = 3159*3 = 9,477
The end of sixth hour = 9477*3 = 28,431
The end of seventh hour = 28341*3 = 85,293
The end of eighth hour = 85293*3 = 255,879
The end of ninth hour = 255879*3 = 767,637
The end of tenth hour = 767637*3 = 2,302,911
The correct answer is D.2,302,911
