P (total amount)=7000 N (time duration)=1 R1(rate)=8% R2(rate)=10% First invast 30000 in R2 rate(max) I=PR2N ÷100 I=30000*10*1÷100 I=3000 Now invast left 40000 in R2 rate I=PR2N÷100 I=40000*8*1÷100 I=3200 Total interest=3000+3200=6200 It is max interest at this rates.......