PLEASE READ: We apologize for the little error made in the video. 0:46 - You will notice that the rate given in the problem is 20% while.. 1:46 - the rate given was suddenly changed to 15% Even if the rate given was changed, the process in getting mark up price is the same, and the answer is still correct given the 15% as the rate. (Please disregard the first given which is 20% as the rate, to avoid confusion). Thank you!