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

### Instruction:
Youngsville had a population of 684 people.  The town had a growth spurt and the population increased by 25% then they witnessed that 40% of the population moved away.  What is the current population?

### Response:
 Mji ulikuwa na watu 684 kisha ukapata kipindi cha ukuaji wa 25% ambapo idadi ya watu iliongezeka kwa 684 * 0.25 = 171.
Mji ulikuwa na watu 684 kisha wakaongeza 171 kutokana na kipindi cha ukuaji, hivyo idadi ya watu ikawa 684 + 171 = 855.
Kulikuwa na watu 855 na 40% walihamia, hivyo idadi ikapungua kwa 855 * 0.40 = 342.
Mji ulikuwa na watu 855 na watu 342 walihamia, hivyo idadi mpya ya watu ni 855 - 342 = 513 watu.