The treasury shares transactions (given below) has happened under the cost method in Sadeen company: On January 5, Sadeen bought 300 ordinary shares as treasury shares at 55. On April 15, Sadeen sold 50 shares of treasury shares at 50. On December 20 , Sadeen sold 40 treasury shares at 60. What is the increase or decrease of the retained earnings due to the transaction in April 15 ( just write the amount)