1 point) The commission charged for investing is $60 plus 1.8% of the principal. An investor purchases 300 shares at $19.97 a thare, holds the stock for 22 weeks, and then nells the stock for $23,47 a share. (a) At the time the investor purchases, the investment's principal is the commission is for a total investment of (b) At the time the investor nellin, the principal is a commission of for a total return of (c) Based on the total investinent you computed as the last answer in part (a), the fotal retum you computed as the last antwer in part (b), the time of 22 weeks (and there are 52 weeks in a year). what annual rate of interest earned? r= dollars is charged dollars. so the annual interest rate (as a percent) is percent Your answer to the final question must be EXACT. If you have all questions but the last question go green, your answer is not exact. Peplace the inexact work borrowed from parts (a) and (b) with exact values when answering the last queetion in part (c), or as a more useful general practice, use exact values for all questions in