Although the Google spreadsheet samples find their best utility in storing office records, they can also be used personally to keep track of expenditure or other activities. For corporates, time is a huge constraint and thus there is no question of creating fresh documents.
People rely more on cloud than on electronic memory to store their data. They are reliable as there is no possibility of losing valuable information over cloud. Thus people generally create a Google account and effectively store data there. Such spreadsheet samples come handy then.
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