Anna asks her broker to divide her investment of $2000 among three funds, x, y, and z. she decides that her investment in x should be twice her investment in z. during the first quarter, x earned 4.5%, y earned 2.6%, and z lost 0.2%. anna earned $58 on her investment during that period. how many dollars did the broker put into each fund?

You are the manager of a large crude-oil refinery. as part of the refining process, a certain heat exchanger (operated at high temperatures and with abrasive material flowing through it) must be replaced every year. the replacement and downtime cost in the first year is $165 comma 000. this cost is expected to increase due to inflation at a rate of 7% per year for six years (i. e. until the eoy 7), at which time this particular heat exchanger will no longer be needed. if the company's cost of capital is 15% per year, how much could you afford to spend for a higher quality heat exchanger so that these annual replacement and downtime costs could be eliminated?