Margo borrows $400, agreeing to pay it back with 5% annual interest after 6 months. how much interest will she pay?

$20 of interest. An easy way to think about this problem is first to solve for 10 percent which is easy because you just move the decimal to the left one place, then 5% is half of 10% which is equal to 40 so 40 divided by 2 equals 20

The answer to your question is b’(16,14)