To find out how many guests Rafael can invite if he wants to spend $250, we can analyze the pricing structure:
- For 0 to 10 guests: $100
- For 11 to 20 guests: $150
- For 21 to 30 guests: $200
- For 31 to 40 guests: $250
- For 41 to 50 guests: $275
Since Rafael wants to spend $250, he can invite between 31 and 40 guests.
Thus, the correct range is:
30 < x ≤ 40 (30 less than x less-than-or-equal-to 40)