Patent Document ID: 4446528
Application ID: 06350044
Patent Flag: 1

Claim One:
1. An apparatus for determining the most economical purchase among products available in at least two sizes, and at different prices, comprising: (a) a first register for storing numerical values corresponding to the product prices and the product sizes; (b) a keyboard connected to inputs of the first register for entering data corresponding to the numerical values; (c) an arithmetic unit connected to outputs of the first register for calculating price/size ratios corresponding to each of the stored prices and the stored sizes, the arithmetic unit providing a numerical ratio for each of the product sizes which reflects a price divided by the corresponding product size; (d) a second register connected to outputs of the arithmetic unit for storing the numerical ratios; (e) a value comparator connected to outputs of the second register for determining the smallest of the numerical ratios; (f) means connected to outputs of the value comparator for selecting the smallest numerical ratio as an output; and, (g) an indicator corresponding to each product size, one of which indicators displays the selected output of the value comparator.