Which answer choice correctly states the relationship between inputs, outputs, and changes in the level of productivity?
A)
An increase in productivity results when more goods can be produced by
increasing the amount of inputs.
B)
An increase in productivity results when more goods can be produced
using the same amount of inputs.
C)
A decrease in productivity results when more goods can be produced using
the same amount of inputs.
D)
A decrease in productivity results when more goods can be produced by
increasing the amount of inputs.
Please help me with this

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?