Tasha and Amy start walking at the same time from the same point in the same direction. Tasha starts with a 20 cm step and increases her stride by 9 cm each step. Amy starts with a 50 cm step and each subsequent step is 95% as long as the preceding one. If they continue to walk in this manner, who will be ahead after 20 steps and by how much? Show all of your work for your calculations, and round to the nearest hundredth when needed