Mr.Robin is right. He has given the languages in the right order also. Spanish is spoken widely in many countries - other than English. But if you plan to benefit, try Japanese, mandarin (Chinese)
I would suggest Spanish.
There is a huge Spanish speaking population in the world.
Even in USA Hispanic people form a large chunk of population.
Learning Chinese or Japanese would also give you business opportunities of translation.
Our nation is increasing business dealings with these two countries.
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