**Answer:**

PV= $1,876.87

**Explanation:**

Giving the following information:

Rosalie wants to have $7,500 in 18 years. Use the present value formula to calculate how much Rosalie should invest now at 8% interest.

We need to use the following formula:

**PV= FV/(1+i)^n**

PV= 7,500/(1.08^18)= $1,876.87

**Answer:**

Rapid population growth strains political institutions and increases pressure on services.

**Explanation:**

Marginal cost **equals both average variable cost and average total cost at their respective minimums.**

<u>**Option: D**</u>

<u>**Explanation:**</u>

A reduction in the overall cost of output arising from the output or manufacture of one additional item, is understood as **marginal production value**. To measure marginal value divide the increase in cost of output by quantity adjustment. The **aim of the marginal cost analysis is to evaluate the point at which an enterprise** can obtain economy of scale in order to maximize output and total activities.

The marginal cost is equal to the marginal revenue. **Fixed costs and variable costs compose of the manufacturing costs.** With an increasing or decreasing in levels of production, fixed costs do not shift, and the same price can be distributed over other output units, with increased demand.