 
 <prompt> Calum na-eme ihe ọ bụla na aha ụlọ akụ na ọ bụla na-akpọ disco maka ike ibe ya. O nwere ike iji ihe a na-eme na-akpọ na ọ bụla ọ dị ka ọ dịghị n'akụkọ ya. O nwere ike iji ịgba 4 disco balls na 10 oku oti. Ọnụ ọkwa oku oti bụ $25. Akụkọ Calum na-akpọ na ọ bụla na-akpọ disco na ọkwa $330. Kedu ihe, n'akụkọ, Calum na-akpọ iji na ọ bụla disco?

```python
# Python code will remain as is
``` <response>: ```Ọcha ga-emezie Calum n'ime 10 oku ocha * $25 n'okwu oku ocha = $250.
Nke a na-akwado $330 ego - $250 ego a na-eme n'okwu = $80 ka ị ga-eme n'ime disco balls.
Calum nwere ike iji ya na-eme $80 ego a na-eme / 4 disco balls = $20 na ọdịnala disco ball.

Answer bụ 20.``` 