月供为280000*(1+5.88%/12)^120*(5.88%/12)/((1+5.88%/12)^120-1)=3091.728元。还款6年剩余4年48月(期),剩余3091.728*((1+5.88%/12)^48-1)/(5.88%/12)/(1+5.88%/12)^48=131955.7元未还。年利率按5.88%,你可以按照贷款合同中的利率计算。