When you convert percent to decimal, you would move the decimal 2 places to the left. You move it to the right when you are calculating decimal to percent. In this case, 1.25 to decimal would be 125%. 12.5% to decimal would be 0.125. So 12.5% is the answer.
Vol of sphere =4/3πr³ let the radius of cone be x. vol of cone =1/3πx²h when h=r, =1/3πrx² since they have the same volume, 4/3πr³=1/3πrx² 4πr³=πrx² x²=4r² x=2r (radius)