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

### Instruction:
 Marlene anataka kununua nusu ya dazeni ya mashati ili kufaidika na punguzo. Bei ya kawaida ya shati ni $50 na sasa inauzwa kwa punguzo la 20%. Marlene atalipa kiasi gani kwa mashati hayo?


### Response:
 Marlene anataka kununua 12/2 = <<12/2=6>>6 mashati.
Bei ya punguzo ya shati ni $50 x 20/100 = $10.
Hivyo, shati litagharimu $50 - $10 = $<<50-10=40>>40 kila moja.
Hivyo, Marlene atalipa $40 x 6 = $<<40*6=240>>240 kwa mashati hayo.