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 $. this cost is expected to increase due to inflation at a rate of % per year for years (i. e. until the eoy ), at which time this particular heat exchanger will no longer be needed. if the company's cost of capital is % 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?