First, subtract the two values:
16 - 15.4 = 0.6
Now divide this to the actual area:
0.6 / 15.4 = 0.038961039
Multiply by 100:
0.038961039 * 100 = 3.8961039
So the percent error is approximately 3.9%
1 3/4 of the cup will be the other liquid because if you take 1/4 from 2, that would be 1 3/4.
I think it would contain 0.2915 ounces of pure gold in it. sorry if my answer isnt correct
