Chapter 2 - Solving Equations - 2-9 Percents - Practice and Problem-Solving Exercises - Page 141: 30

33 dollars

Recall, I=Prt, where I is interest, P is the principle (the amount of money invested), r is the rate (which equals the original percentage divided by 100) and t is the time, in years. Thus, we obtain: $I=(150)(5.5/100)(4)=33$ dollars