Area of towel = l×b =100 cm × 50cm = 5000cm2 Now, length decreased by 20% and breadth decreasedby 10% l = 100 – 20% of 100 = 80cm b = 50 – 10% of 50 = 45cm New area = l × b = 80cm × 45cm = 3600cm2 Change in area =(5000–3600)cm2=1400cm2 % change in area =