In​ basketball, "one-and-one" free throw shooting​ (commonly called foul​ shooting) is done as​ follows: If the player makes the first shot​ (1 point), she is given a second shot. If she misses the first​ shot, she is not given a second shot​ (see the tree​ diagram). Christine, a basketball​ player, has a​ 70% free throw record.​ (She makes​ 70% of her free​ throws.) Find the probability​ that, on a given​ one-and-one free throw shooting​ opportunity, Christine will score one point.