Question 1147184
I=prt
I 1=8000*r1*1=8000 r1
I 2=2000 (r1-0.004)
I 2+392=I 1
so 8000 r1=2000 r1-8+392
6000 r1=384
r1=384/6000=0.064 or 6.4%
r2=6 % 

so $8000*0.064=$512
and $2000*0.06=$120