Reading 45, Question 4 and Question 7, CFA Practice Problem 445, 555, exactly, getting, numbers

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Question 4  I keep getting an error when I type in the TVM numbers, trying to solve for I/Y (the six month yield). What am I doing wrong? I type it in exactly as the answer states…..
Question 7  It says that the target debttoequity ratio is 0.8033. How do they get the respective weights of .445 for Debt and .555 for Equity?? This probably so simple but please help…..