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U30 = 30 x (2.30-10) ÷ 2
= 30 ×( 60-10) ÷ 2
= 30 × 50 ÷2
= 150 ÷ 2
= 75
= 30 (60-10) : 2
= 30 (50) : 2
= 1500 : 2
= 750