Escape velocity v_e = √2 * v_orbital. Kinetic energy is proportional to v². The required K.E for escape is K_e = (1/2)m(v_e)² = (1/2)m(√2v_o)² = 2 * [(1/2)mv_o²] = 2 * K_o. The increase required is K_e - K_o = 2K_o - K_o = K_o, which is a 100% increase.