(29.97%) of 9840 + ? + (45.17% of 1240) = (31.99% of 11750)
(29.97%) of 9840 + ? + (45.17% of 1240) = (31.99% of 11750) => 30% of 9840 + ? + 45% of 1240 = 32% of 11750 ⇒ 2952 + ? + 558 = 3760 ⇒ ? = 250
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