Answer:
$8000
Step-by-step explanation:
Let it be that investment in A is x dollars, then Jim invested in B x+3000.
x/100*8=0.08x- the profit from A, (x+3000)/100*7= 0.07x+210
0.08x+0.07x+210=960
0.15x=750
x=750/0.15= 5000
5000+3000=8000dollars- investment in B