1600. My calculator - well, my brain, actually - tells me so.
800 + 800 + 800 + 800 + 800 = 4,000
300 + 800 = 1100
800 + 2 = 802
The answer is 259. Simply add the numbers together arithmetically as you would for the problem two plus two. To check your work, a calculator is the best option.
900