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

### Instruction:
Jessica wrote a long letter to her aunt and needed to put stamps on it to mail it. She used eight pieces of paper that weigh 1/5 of an ounce each, and her envelope weighs 2/5 of an ounce. She needed one stamp per ounce. How many stamps did Jessica need to mail her letter?

### Response:
 Karatasi za Jessica zina uzito wa 8 * 1/5 = 8/5 unsi.
Karatasi ndani ya bahasha ina uzito wa 8/5 + 2/5 = 10/5 = <<8/5+2/5=2>>2 unsi.
Hivyo, Jessica anahitaji stempu 2 * 1 = <<2*1=2>>2 ili kupeleka barua yake.