? = 15% of 2400 + 140% of 4200 – 12 3
ATQ, ? = 15% of 2400 + 140% of 4200 – 123 ? = 0.15 × 2400 + 1.4 × 4200 – 1728 ? = 360 + 5880 – 1728 ? = 4512
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