They didn't ask when it was invented.. they asked when was it first sold in stores. All i know is if you're smart and you were not sure of the answer.. just divide the money into equal parts.. That's what happens when people get greedy..
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Arthur Fry first invented the Post-it Note in 1974 while looking for a bookmark. Fry took some of Dr. Spencer Silver's adhesive and applied it to the edge of a piece of paper and solving his problem. Using this year, Post-it Notes are 37 years old. However, Post-it Notes were not manufactured till 1977 and the official launch wasn't till a year later in 1978.
In this case, our research team spoke directly with 3M, and they confirmed that although they had given out free samples in test markets in 1977 and 1978, it wasn't until 1980 that Post-Its were sold in stores.
A couple million appliances are sold Per year
There are about 40 million hockey pucks sold per year
The Amount Of CD Players That Are Sold Every Year Are 120,000,000 Roughly. There You Go