Final answer:
The total costs equal $3,500.
Step-by-step explanation:
To find the total costs, we need to multiply the variables x, v, and f together. This can be done using the formula:
Total Costs = x * v * f
Substituting the given values:
Total Costs = 35 * 100 * 1000 = $3,500
Therefore, the total costs equal $3,500. So the correct option is (b) $3,500.