What was the first type of computer used by business and government agencies?
If you are referring to digital computers, the first used by government agencies is generally reckoned to be ENIAC – used for various things by the America military in the 1940s. The first to find a real use in business was UNIVAC, dating from the 1950s. But… If you are not talking digital computers, businessmen and governments used the ABACUS to perform calculations, but I guess this was more like a pocket calculator, since it is not programmable – one of the requirements of being described as a computer.