(? + 16) × 12 + 25% of 840 = 252 + 5
ATQ, (? + 16) × 12 + 25% of 840 = 252 + 5 (? + 16) × 12 + 0.25 × 840 = 625 + 5 ? + 16 = (630 – 210) ÷ 12 ? = 35 – 16 ? = 19
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