The department store sold a commodity. In January, it sold a piece and made a profit of 30000 yuan 4 yuan, but the sales volume increased by 5000 pieces compared with January, so the profit was y yuan more than January (1) Finding the relation between Y and a=_________ )

The department store sold a commodity. In January, it sold a piece and made a profit of 30000 yuan 4 yuan, but the sales volume increased by 5000 pieces compared with January, so the profit was y yuan more than January (1) Finding the relation between Y and a=_________ )

y=30000a—（30000/a-0.4）*（a+5000）
January sales profit = 30000 a
Unit price of goods sold in February = 30000 / a-0.4
Sales profit in February = (30000 / a-0.4) * (a + 5000)

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