Each year on the same day, Susan deposits $100 into a savings account that earns simple interest at a rate of 5%. If she makes no withdrawals, how much total interest has Susan’s savings account earned after 5 years?

Isabelle is mixing red and blue paint to make purple paint she adds 3/10 of a fluid ounce of red to 12/25 of a fluid ounce of blue to make 1 1/30 fluid ounces of purple how many fluid ounces of red paint ounces of red paint will she need to make 3 fluid ounces of purple paint