A company reports the following information: Month Units Sold Total Cost January 960 $ 5,510 February 1,860 $ 7,020 March 2,520 $ 8,700 April 660 $ 4,050 Using the high-low method, the estimated total fixed cost is:

$1,560.

$4,050.

$6,060.

$3,480.

$2,400.