The only people that share 100 percent of their genes with one another are

Identical twins or monozygotic twins

Explanation:

Identical twins are also called as monozygotic twins. Here, one sperm fertilizes an egg leading to formation of one zygote. The very first division in single zygote forms two identical cells that develop into two embryos. Since the resultant two embryo are derived from same zygote, they share 100% of their genes with each other.

800 W

Explanation:

 Power is the rate at which work is done. That is, time taken to do a certain amount of work.

Mathematically, power = work done ÷ time taken

But work done = force × distance/displacement

Then work done = 200 N x 8 m = 1600 Nm = 1600 J (since 1 Nm = 1 J)

So power = 1600 J ÷ 2 s = 800 Js^(-1) = 800 W (since 1 Js^(-1) = 1 W).