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

### Instruction:
At its current growth rate, a certain plant will be 80 feet tall after a year. If the plant grows at the same rate every month and is currently 20 feet tall, what's its monthly growth rate in feet?

### Response:
 Ikiwa mmea una urefu wa futi 20 kwa sasa, utakuwa umekua kwa futi 80-20=60 baada ya mwaka.
Kwa kuwa mwaka una miezi 12, na mti hukua kwa kiwango kile kile kila mwezi, mti hukua kwa futi 60/12=<<60/12=5>>5 kila mwezi.