def mrua(x0, v0, a, t):
    """
    >>> round(mrua(0, 0, 6, 5), 2)
    75.0
    >>> round(mrua(10, 0, 2, 20.3), 2)
    422.09
    """
    x = x0 + v0*t + (1/2)*a*t**2
    return x