An index to interest : containing I. The largest tables of simple interest that have yet been made publick ..., II. A table of discount ..., III. Two tables shewing by inspection the present worth of annuities and the purchase thereof ..., IV. An easie table for the valuation of any number of years lapsed in a church or college-lease of land ..., V. Tables of the amount and present worth of any sum of money and of annuities to 61 years ... : also, the full use of all the tables ..., likewise easie rules for valuation of 1, 2, and 3 lives : together with a new invented circle for the easie finding the number of days contain'd between any two in the year ... /