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具体计算方法如下:1. 计算利息:利率 = 年化收益率 / 365 × 放款天数;假设年化收益率为 5%,放款天数为 20 天,则利率为 5% / 365 × 20 = 0.27%。2. 计算利息收益:利息收益 = 放款金额 × 利率;假设放款金额为 50 万,则利息收益为 50 万 × 0.27% = 1350 元。3. 计算到手收益:到手收益 = 利息收益 × (1 - 税率);假设所得税率为 20%,则到手收益为 1350 × (1- 20%) = 1080 元。因此,开通科创板50万放20天的收益为1080元。需要注意的是,这只是按照5%年化收益率计算的参考数据,实际的收益率可能会因为市场波动等原因有所变动。