Deepa Dalal opened a free$-$standing radiology clinic. She had anticipated that the costs for the radiological tests would be primarily fixed, but she found that costs increased with the number of tests performed. Costs for this service over the past nine months are as follows:

Month Radiology Tests Total Cost

January $2,800$ $$133,500$

February $2,600135,060$

March $3,100175,000$

April $3,500170,600$

May $3,400176,900$

June $3,700186,600$

July $3,840174,450$

August $4,100195,510$

September $3,450185,300$