Answer:
17%
Step-by-step explanation:
First, you need to know that the human genome have approximately 3,000 millions of base pairs, so if this retrotransposon is about 1,000 bp and have 516,000 copies, it will have 516,000,000 of base pairs in total. If you divide 516 millions by 3000 millions and then multiply it by 100, it will give you the percentage of the human genome accounted for this transposon.