This answer would be false srry if im wrong but thats what i think
12 x 15 = 180
180 x 2 = 360
360 square yards of carpet should be ordered.
Percent of Increase = Increase / Original * 100%
Increase = $33 - $30 = $3
Original Price = $30
Percent Increase = $3 / $30 * 100% ==== 10%