***** Please explain with steps ( show appropriate equations also ), Thank you !

Correct answer is $3960. I can not figure out how we came to this answer .

\"C A n: AW: 510.50 35.00 33.05 22.03 29.05 0 13-0 150 2.10 llinlll'gl' Figure 1 shows the east and demand curves for a profitmaximizing firm in a perfectly competitive market. What is lite amounl of Its total variable me! it the market price is 530 and it me rm is producing output? {Rater to figure 1} Select are a $1200 " I: $6.450 t. $5.400 ' t! $3.950