Let x be the original price (before the 20% markwown). The problem says (1-0.2)x = 120 dollars, or 0.8x = 120; x = 120/0.8 = 150 dollars. Thus the original price of the dress was $150. Hence, at 10% markdown, the celling price would be 150 - 0.1*150 = 150 - 15 = 135 dollars. ANSWER