A person invests $1200 in an account earning 3% simple annual interest how much will be in the account after 2 years

This is simple interest, which means every year you gain 3% of $1200. You gain this for two years, so we have:

1200 + (3% of 1200) + (3% of 1200)

1200 + (0.03 x 1200) + (0.03 x 1200)

1200 + (36) + (36)

1272

There will be $1,272 in the account after 2 years.

I knew that but i wasn't sure