Answer :
Location choice I have monthly fixed costs of $100,000 and per-unit variable costs of $10. $102,500 is its total cost at a monthly volume of 250 units.
"Cost" in the singular refers to the aggregate group sum. "Cost" refers to all pieces in that group. For example, "The cost of a service includes the cost of materials and labor." From legal contracts to budget discussions, the difference between "cost" and "cost" often confuses people.
"Cost" is past tense: "How much did it cost you when you bought it 10 years ago?" "Cost" is present tense: "You bought this a long time ago." Now it's more expensive." If you're talking about how much money the person spent on the item, then 'cost' is the correct choice.
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