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The correct inequality is A: 50 + 6.25x ≤ 100; x ≤ 8
To solve the inequality:
50 + 6.25x ≤ 100
6.25x ≤ 50
x ≤ 50 / 6.25
x ≤ 8
Therefore, the number of children who can attend the birthday party should be 8 or less in order for Gina to spend no more than $100.