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)