After getting her first job, a college graduate wants to begin saving money so she can pay cash for a new car. She wants to save enough each month to have $21,000 at the end of 4 years, and her savings account pays 4% interest, compounded monthly. How much will she have to save each month to reach her goal? Express your answer in $ to the nearest whole $.

Aproperty title search firm is contemplating using online software to increase its search productivity. currently an average of 40 minutes is needed to do a title search. the researcher cost is $2 per minute. clients are charged a fee of $400. company a's software would reduce the average search time by 10 minutes, at a cost of $3.50 per search. company b's software would reduce the average search time by 12 minutes at a cost of $3.60 per search. which option would have the higher productivity in terms of revenue per dollar of input?