What is the salt to water ratio in the Great Salt Lake? For a science project?

I need it for a science project quickly like Tonight! I need a cup of salt water... how much salt should I mix in? Like how many tspns p/ tablespoons or per cup or whatever.. help!What is the salt to water ratio in the Great Salt Lake? For a science project?
"The total amount of salt dissolved in Great Salt Lake is about 4.5 to 4.9 billion tons. As the lake rises, its salinity drops because the same amount of salt is dissolved in more water. The lower the lake level, the saltier the lake becomes. In historical time, the lake's salinity has ranged from a little less than 5 percent, (just above that of sea water), to nearly 27 percent (beyond which water cannot hold more salt)."

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"The chemical composition of Great Salt Lake is similar to that of typical ocean water. Sodium and chloride are the major ions in the water, followed by sulfate, magnesium, calcium, and potassium. For comparison, the table below shows the concentration of the six major ions in water of Great Salt Lake, a typical ocean, and the Dead Sea. "