This preview shows page 1. Sign up to view the full content.
Unformatted text preview: deal with problems of pasturage, brokerage, discount, tare allowance, adulteration of commodities, barter, and currency exchange. Not only did every city have its own currency, but its own weights and measures! The universal mathematical tool of literate commercial people in the Renaissance was the Rule of Three , also called the Golden Rule and the Merchant's Key . In his Del abaco , Piero explains how to use the rule of three to solve a proportion: "multiply the thing one wants to know about by the thing that is dissimilar to it, and divide by the remaining thing. The result is dissimilar to the thing we want to know about."...
View Full Document
- Fall '10