陈先生当月应缴纳的个人所得税
= [(3750-2000)* 10%-25] + [7680 *(1-20%)* 20%*(1-30%)] + [(3800-800)* 20%]
= 150 + 860.16 + 600
= 1610.16
王先生当月应缴纳的个人所得税
= [(4580-2000)* 15%-125] + [5200 *(1-20%)* 20%*(1-30%)] + [(3300-800)* 20%]
= 262 + 582.4 + 500
= 1344.4