.
Total = 300*(1 + 0.045*3) + 100*(1+0.03)^3 = 449.47 dollars. ANSWER
Solved.
----------------
See the lessons
- Simple interest percentage problems
- Compound interest percentage problems
to get introductory knowledge on the subject (= QUICK START).
They are written specially for you.
Read them and become an expert in this area.
Consider these lessons as your textbook, handbook, tutorials and (free of charge) home teacher.