$$18,300$ received at the end of $15$ years. The discount rate is $5$ percent.

$$5,800$ received at the end of four years and $$11,600$ received at the end of eight years. The discount rate is $7$ percent.

$$1,300$ received annually at the end of each of the next seven years. The discount rate is $6$ percent.

$$40,000$ received annually at the end of each of the next three years and $$65,000$ received at the end of the fourth year. The discount rate is $3$ percent.