You are given a passage. Using the information present in the passage, you need to classify it into one of the 10 topics: 0 - 'Society & Culture', 1 - 'Science & Mathematics', 2 - 'Health', 3 - 'Education & Reference', 4 - 'Computers & Internet', 5 - 'Sports', 6 - 'Business & Finance', 7 - 'Entertainment & Music', 8 - 'Family & Relationships', 9 - 'Politics & Government'.

[Q]: The earliest form of currency used was large stones that could be used to get food and meat in exchange - this was during the stone age. Before this there was a barter of goods (so i am not considering it currency)
Large stones which were round were considered more valuable since they were more difficult to obtain

The first recorded accounts of currency date back to 2000 BCE and silver or metal tokens were used to represent a stored value of grain. Also these were useful to ensure that a shipment of commodities arrived with the same goods that were shipped

Paper money was used in the 18th century, but only in the late 18th and through the 19th century was a central monetary authority created in various states that had a virtual monopoly of creating bank-notes that had to be accepted as legal tender everywhere (Prior to this, the one accepting payments could refuse the payment if it was not in a currency which had been predetermined before the loan or in general use: Note gold and silver were widely used as legal tender)
[A]: 0

[Q]: 110 Volts is nominal and may vary when measured by a voltmeter. That said, power is supplied using sets of three separate parallel wires that you can see up on most power poles. The very high voltage there is stepped down using a transformer to supply most houses and businesses with a usable lower voltage. The voltage between any one of the three wires to ground in a house is 110 Volts for example to light a light bulb. The voltage between any two wires is 220 Volts and is used for example to power a clothes dryer or kitchen range. Houses do not use all three wires. A machine shop may power a large motor by connecting all three wires (in a delta or Y configuration) to obtain 440 Volts. Therefore the progression of 110, 220, and 440 Volts stems from the use of single, two and three-phase wiring circuits. Electrical power is conducted cross-country at very high voltages using high tension lines strung in sets of three wires or phases which produces the multiple of 11 you mention. Incidentally there may be an additional single wire above all the rest to arrest lightning strikes.
[A]: 1

[Q]: The product tour link below should help you with this question.
[A]:
4