A manufacturing business has the following costs for the month ahead:

Fixed costs: $40,000$

Variable costs: $30$ per unit

Semi$-$variable costs: none

Stepped fixed costs: $10,000$ if produce in the $0-500$ unit range, then step by $10,000$ if produce in the $501-1,000$ unit range, then step by $10,000$ if produce in the $1,001-1,500$ unit range, and so on$.$

What is the total cost for the business if they produce $2,100$ units next month?

A$.90,000$

B$.113,000$

C$.143,000$

D$.153,000$