Savings account $= 4\%$ of total. If savings = \100$:

$\text{Total} = \frac{100}{0.04} = \$2,500$

Equities $= (2x + 4)\%$. Since all percentages sum to $100\%$:

$4 + x + (2x + 4) + 50 = 100$ $3x + 58 = 100$ $3x = 42 \Rightarrow x = 14$

Equities $= 2(14) + 4 = 32\%$

$0.32 \times 2,500 = \$800$