I need help on #1, to solve I did 0.2 x 1600= 320 then I added 320 + 1600= 1920 and the correct answer is 2000. What did I do wrong?

I need help on 1 to solve I did 02 x 1600 320 then I added 320 1600 1920 and the correct answer is 2000 What did I do wrong class=