A valuation of annuities and leases certain, for a single life : With tables, showing at one view the value of them, in years, and the eighth part of a year, for every year of life, from the age of 1 to 70, and from thence to the end of life, for every period of five years. At the several rates of 3, 4, 5, and 6 per cent. interest. By Weyman Lee, Esq; of the Inner Temple.