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

### Instruction:
Bob has planted corn in his garden, and it has just started to sprout. A week after planting it, it had grown 2 inches. The next week, its height increased by twice as much as it had the first week. In the third week, it grew 4 times as much as it did the week before. How tall are the corn plants now?

### Response:
 Wiki ya pili yalikua mara mbili ya wiki ya kwanza, hivyo inchi 2 * 2 = <<2*2=4>>4.
Wiki ya tatu yalikua mara nne ya wiki iliyopita, hivyo inchi 4 * 4 = <<4*4=16>>16.
Jumla ya urefu uliongezeka ni inchi 2 + 4 + 16 = <<2+4+16=22>>22.