Answer:
Step-by-step explanation:
Let say x the amount of the first bill,
2x the second,
2x-500 the third
x+2x+2x-500=8000
5x-500=8000
5x=8000+500
5x=8500
x=1700
2x=3400
2x-500=2900
Proof: 1700+3400+2900=8000
