Spanish will help you on the SAT too. Verdant, pensive, castigate, just a sample of vocabulary words in English that Spanish speaking people would easily get correct on a multiple choice test, if not come up with the right answer, even without answers being provided, even if theybhad never heard of the words in English.
Not that I am trying to talk you out of Chinese, I think it could be very useful, and give you a big advantage in many industries; although as someone pointed out there are many languages spoken in China, I think Mandarin is the most common? I would guess Chinese businessmen speak English, like in Japan, and places like Singapore English is the official language of the government, although there are 4 or 5 official languages of the country. Spanish is useful here in the US, and obviously Latin America if you will be dealing with the end consumer, marketing and advertising, or if new immigrants will be working in your business. Do you have any idea what you are interested in pursuing as a career?