Answer:
If you have 5% of the total cost of the apartment, as you mentioned, you have $12.75 (5% of $255). Therefore, you would need $242.25 ($255 - $12.75) more to purchase the apartment.
If you have 25% of the total cost of the apartment, as you also mentioned, you have $63.75 (25% of $255). Therefore, you would need $191.25 ($255 - $63.75) more to purchase the apartment.
Regarding the "25-50" portion of your question, I assume you mean you have between 25% and 50% of the total cost of the apartment. If you have 25% of the total cost of the apartment, you have $63.75 (25% of $255). Therefore, you would need $191.25 ($255 - $63.75) more to purchase the apartment. If you have 50% of the total cost of the apartment, you have $127.50 (50% of $255). Therefore, you would need $127.50 ($255 - $127.50) more to purchase the apartment.
Step-by-step explanation: