4-4: Staci invested $950 five years ago. Her investment paid 72% interest compounded monthly. Staci's twin sister Shelli invested $900 at the same time. But Shelli's investment earned g% interest compounded quarterly. How much is each investment worth today? 4-8: If Quincy can invest at an opportunity cost rate equal to 12% compounded monthly, what lump- sum amount should he invest today so that he has $22,000 to buy a new car in 3 years