Arrange these quantities in kg unit 1kg20g,1.2kg,120g.show working

1kg 20g = 1kg + 20g = 1000g + 20g = 1020g

1.2kg = 1.2 * 1000g = 1200g

120g = 120g

So, the quantities in kg units are:
1.2kg, 1kg 20g, 120g