Zeynep invested 1000 units in a bank. The Bank applies an annual nominal interest rate convertible to 6 months for the first 5 years and an annual nominal interest rate of 2 which can be converted to 3 months for the following years. Find the value of x since the cumulative value at the end of the 5th year is x and the cumulative value at the end of 10.5 years is 1980 units.