Please Help.

The phone bill for Ace Accounting consists of both fixed and variable costs. Refer to the four month data below and apply the high-low method to answer the question. (Round your intermediate calculations to two decimal places.) Minutes Total Bill May June July August 470 220 160 $2,640.00 300 $2,880.00 $3,100 $2,700 What is the fixed portion of the total cost? OA. $2,402.57 O B. $2,640.00 O C. $2,165.14 O D. $1,719.97