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The following development of money have therefo... - JAMB Commerce 2019 Question

The following development of money have therefore been the use of, except______

A

Coins

B

Inconvertible paper money

C

Commodities

D

Abacus

correct option: d

The abacus, also called a counting frame, is a calculating tool that was in use in the ancient Near East, Europe, China, and Russia, centuries before the adoption of the written Arabic numeral system. The exact origin of the abacus is still unknown. Wikipedia

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