Please reason step by step, and put your final answer within \boxed{}.
Krishna and Callum are playing a game where they earn 10 points if they win any round. In this game, there is a point multiplier for consecutive wins that doubles the points earned for each additional win in a row (for example, if a player wins two rounds consecutively, they earn 20 points for the second win; if they win three rounds consecutively, they earn 40 points for the third, and so on). Additionally, after a player experiences two consecutive losses, the points earned for each subsequent loss are decreased by half (for example, if a player loses three rounds consecutively, they earn only 5 points for the third loss, and if they lose four rounds consecutively, they earn only 2.5 points for the fourth loss, and so on). If they played fifteen matches and Krishna won 3/5 of the matches, determine the total number of points Callum earned, considering the point multiplier for consecutive wins and the decreased points for consecutive losses.
user