Barbara owns a small shop where dresses are made. At the end of a given month, she has 250 dresses. Her expenses for the month are $1,000 for rent, $6,000 for wages, $1,500 for fabric and thread, and $500 for electricity. Her total variable cost for the month is

a. $6000
b. $4,000
c. $32 per dress
d. $7,500
e. $8,000

E