The correct answer is - currency.
The objects or group of objects that have been widely agreed upon to be used a s form of exchange is called currency. The currency is a very useful method for exchanging things, and it has been widely accepted around the world, with some currencies being globally accepted, while some only regionally, or locally.
The reason why the currencies have been introduced is so that the two or more sides in the process of exchange have the same means and valuations, thus making the exchange very easy. Some of the strongest currencies in the world are the American Dollar, Euro, British Pound, Swiss Frank...
You probably went to far south
Well since a hundred board should go by 10's until you reach 100, start at 61 then go up 10 spaces and the answer is 71
Hope this helps
~Jordan~
Because it simply is hope this helps tja ks