125% as a fraction would be 125/100, which you can simplify to 5/4, or 1 1/4. 125% as a decimal would be 1.25, because you would do the sum 125 ÷ 100 = 1.25
The central angle is the measure of minor arc AB. The central angle here is 60 degrees, shown by the third circle down from the top. This is the right answer.