To find your wages when you assemble 100 phones using the equation \( y = 0.75x + 30 \), we can substitute \( x \) with 100.
\[ y = 0.75(100) + 30 \]
Calculating this:
\[ y = 75 + 30 = 105 \]
So, your wages if you assemble 100 phones in one day is $105.00.