I need help in these questions. I have only 30 minutes. Please answer them fast.

Monika postponed the purchase of a stereo equipment until she saves money. Her savings earn interest rate of 3%. Inflation rate on the stereo equipment is 5% per year. Which of the following statements must be true? Monika is better of postponing the purchase There is no difference in purchasing power whether Monika buys today or postpones Monika's money grows faster than the increase in price of the stereo equipment Monika is worse off postponing the purchase Question 4 3 pts Upon graduation with BA degree, Jack was offered a $50,000 annual salary job. Instead, Jack went to graduate school. The $50,000 annual salary is an example of a person's worth cost of graduate school opportunity cost target salary