(c) Why was the calculator invented?
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The first solid-state electronic calculator was created in the early 1960s. Pocket-sized devices became available in the 1970s, especially after the Intel 4004, the first microprocessor, was developed by Intel for the Japanese calculator company Busicom
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Even before numbers themselves were invented, people needed a way to keep track of the cost of goods they were selling. To fulfil this need, in ninth century China the abacus was invented- a basic calculating device made out of a wooden frame and counting beads
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