can someone help me with this question and show working please so i can follow along

We have all seen the old "Wild West" movies where the cowboys run around shooting their guns into the air. Have you ever wondered where the bullets go? Once a bullet of mass 25 g leaves the barrel of a gun it travels at about 0.13 times the escape speed from Earth. If shot directly upwards, and neglecting the rotation of the Earth, how high above the Earth's surface would the bullet reach? Give your answer as a multiple of the Earth's radius and to 2 significant figures. Tips: Use g = 9.8 m/s'; check that your units are in base SI units before using them in your calculations; round only at the last steps; and only input a numerical value into the question's Quiz submission box (do not include units, as they are provided for you). RE