What are the two most important management challenges in building a successful e-commerce site? Group of answer choices having an accurate understanding of your business environment and an achievable business plan developing a clear understanding of business objectives and knowing how to choose the right technology to achieve those objectives ) identifying the key components of your business plan and selecting the right software, hardware, and infrastructure for your site building a team with the right skill sets and closely managing the development process

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?