A president for purchasers, sellers and mortgagers, or, Anatocisme (commonly called compound interest) made easie, without arithmetical calculation : by a table ready computed, by which may be known the real worth of any annuity, rent or pension, either in present possession or in reversion (to be paid annually) at six pounds in the hundred (interest upon interest), from one year to an hundred years, and from 20 s. a year, to 100, 500, 1000 l. a year and upward, onely by common addition /