The following two investments accumulate the same amount at the end of 36 months. One investment consists of deposits of 100 at the end of each month for 3 years under the nominal annual interest rate of 6% compounded monthly. The other investment consists of making a deposit of 1800 at the end of the 1st year and another one in the same amount at the end of the 2nd year, under the effective annual interest of i. Calculate i.