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

### Instruction:
Ursula is working at a marketing firm. She created a 30-second long commercial. Her boss told her that this commercial is too long to air and told her to shorten the commercial by 30%. How long will this commercial be after Ursula makes the desired changes?

### Response:
 Bosi wa Ursula anataka matangazo yapunguzwe kwa 30/100 * 30 = <<30/100*30=9>>9 sekunde.
Baada ya Ursula kufanya mabadiliko anayotaka, matangazo yatakuwa ya muda wa 30 - 9 = <<30-9=21>>21 sekunde.