利息=本金x利率x年数利率=(利息/本金/年数)*100%利息=6388.8-6000=388.8元利率=)388.8/6000/3)*100% =2.16%
(6388.8-6000)/6000*100%=6.48%
(6388.8-6000)÷6000÷3=2.16%年利率
6388.8-6000=388.8388.8*(除以)3*6000=2.16%