Bargas Framing's cost formula for its supplies cost is $2,240 per month plus $6 per frame. For the month of May, the company planned for activity of 808 frames, but the actual level of activity was 810 frames. The actual supplies cost for the month was $7,090. The supplies cost in the flexible budget for May would be closest to:

$7,106

$7,088

$7,100

$7,090

Please give me a breakdown (Formula) in how you come up with your answer... I got $7,090 but I'm not positive this is the answer... Please help quickly