\(\$12.00\)
Explanation
Since the cost of the yarn is given in yards, first convert the length of yarn Rosita bought into yards. Since 3 feet = 1 yard, 300 feet = 300/3 = 100 yards. \(\text { Rosita spent } \$ 100 \times 12 \text { cents }=1200 \text { cents }=\$ 12.00\)