We need to get all these quantities in the same form to compare them. Decimal is the most ideal because it is easier to compare numbers. 60%=60/100=0.6; 0.75 stays as it is; 4/5=0.8; 2/3=0.666...67. So the numbers become: 0.6, 0.75, 0.8 and 0.66... To make it a little easier we can write these to two decimal places: 0.60, 0.75, 0.80, 0.67. So the order is 0.60, 0.67, 0.75, 0.80 or, in original form: 60%, 2/3, 0.75, 4/5.