excel 函數關於年終獎個人所得税計算的問題

這個公式能詳細解釋下嗎？我研究了半天都知道怎麼算出的`那個數字。請大家幫幫我！=ROUND(IF((O8+P8-(3500-R8))/12<=0,0,IF((O8+P8-(3500-R8))/12<=1500,((O8+P8-(3500-R8)))/12*3%,IF((O8+P8-(3500-R8))/12<=4500,((O8+P8-(3500-R8)))/12*10%-105,IF((O8+P8-(3500-R8))/12<=9000,((O8+P8-(3500-R8)))/12*20%-555,IF((O8+P8-(3500-R8))/12<=35000,((O8+P8-(3500-R8)))/12*25%-1005,IF((O8+P8-(3500-R8))/12<=55000,(((O8+P8-(3500-R8)))/12*30%-2755),IF((O8+P8-(3500-R8))/12<=80000,((O8+P8-(3500-R8)))/12*35%-5505,((O8+P8-(3500-R8)))/12*45%-13505)))))))*12,2)