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

### Instruction:
An earthquake caused four buildings to collapse. Experts predicted that each following earthquake would have double the number of collapsing buildings as the previous one, since each one would make the foundations less stable. After three more earthquakes, how many buildings had collapsed including those from the first earthquake?

### Response:
 Tetemeko la ardhi la pili limesababisha majengo 2 * 4 = <<2*4=8>>8 kuanguka.
Tetemeko la ardhi la tatu limesababisha majengo 2 * 8 = <<2*8=16>>16 kuanguka.
Tetemeko la ardhi la nne limesababisha majengo 16 * 2 = <<16*2=32>>32 kuanguka.
Ikiwa ni pamoja na tetemeko la ardhi la kwanza, tetemeko la ardhi yamesababisha majengo 4 + 8 + 16 + 32 = <<4+8+16+32=60>>60 kuanguka.