Ariane borrows $600 on a 2-year loan. She is charged 5% simple interest per year. How much interest is she charged for 2 years? What is the total amount she has to pay back?

Find out what 5% of $600 is by multiplying them by each other after changing the percent from a percentage form into a decimal.

600*.05=$30

Now add that to $600 every year.

$600+$30=630.

Now add it again since it's for two years.

$630+$30 = $660.

Answer:$660.