At the end of each month payments are made into an annuity For end of the first month the payment is $250, at the end of the sE soond it is snn and st the end of the third it is $200. This same pattern of paymemt is t hen repeated again and twenty years. At the again for the twenty years. Assume an interest rate of 18% com pounded monthly accurmulated value of this annuity at the time of the last payment . Find tl