Several reasons.
1. All units for measuring the same attribute are related by powers of ten and the same prefices are used whether measuring length, mass, energy etc.
2. Many derived units are scaled so that their values are 1 together: for example 1 Newton (force) = 1 kilogram*metre/second2
3. All advanced countries and most of the rest of the world use it.
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1 billion.
the international system of units is based on units of 10 and has 3 main standards, the meter, liter, and gram.
International System of Units
Because it was developed in Europe for international use from the French "Systeme International" (SI)
International System of Units (SI)