Clavis usur?; or, a key to interest, both simple and compound: containing practical rules, plainly express'd in Words at length; whereby, all the various Cases of Interest, and Annuities, or Leases either in Possession, or Reversion, and Purchasing Free-Hold Estates, &c. may very easily be Resolv'd, both by the Pen and a small Table of Logarithms, hereunto annex'd; For all Rates of Interest, and Times of Payment whatsoever; Illustrated by Variety of Examples. To which is added, rules to be observ'd in estimating the value of annuities, or leases, and Insurances for Lives, &c. Also, The Business of Rebate or Discompt, and the Equation of Payments (very useful for Merchants and other Deallers) is here Rectified and truly Determin'd. By J. Ward.

Date:

[1710]