Cubic Bezier curves are commonly used to control the timing of animations. A certain “ease in” curve is given by x = 0.1t³ − 1.2t² + 2.1t, y = −2t ³ + 3t ² for 0 ≤  t ≤ 1, where x represents the percentage of elapsed time for the animation and y represents the percentage of the progression of the animation (both as decimals). What percentage of the animation will be completed after 50% of the time has elapsed?