15. (0/0.62 Points) DETAILS PREVIOUS ANSWERS MY NOTES ASK YOUR TEACHER Ed buys a TV priced at 550 by paying 50 in cash that day, then paying 95 every three months for one year (four payments of 95), and a final payment of Xin 15 months (three months after the final quarterly payment). Find the value of x if there is a three-month effective rate of interest of 4% charged during this 15-month period X - 213.75 X