Download photo math it works good on those kinds of problems
There are 12 parts to the ratio (1 + 3 + 8 = 12).
Divide 54,000 by 12.
54,000/12 = 4,500
Now multiply for each part:
1 = 4,500
3 = 13,500
8 = 36,000
You can check by adding them up (4,500 + 13,500 + 36,000 = 54,000).
So the ratio is 4,500:13,000:36,000
Hope this helps =)
The answer if 7 years, if you multiply 2,000 by .02 it equals 40. so you divide 280 by 40 and get 7