Below is an instruction that describes a task. Write a response that appropriately completes the request in Swahili. Please answer in Swahili.

### Instruction:
Alex is stacking his books in a pyramid. Each level of the pyramid has 80% as many books as the number of books in the previous level. If he makes four levels and the top level has 64 books, how many books are in the pyramid in total?

### Response:
 Katika ngazi ya tatu, kuna vitabu 80 kwa sababu 64 / .8 = <<64/.8=80>>80
Katika ngazi ya pili, kuna vitabu 100 kwa sababu 80 / .8 = <<80/.8=100>>100
Katika ngazi ya kwanza, kuna vitabu 125 kwa sababu 100 / .8 = <<100/.8=125>>125
Jumla ya vitabu ni 369 kwa sababu 64 + 80 + 100 + 125 = <<64+80+100+125=369>>369