Answer: Owen's Electronics will need $9.375 million to finance a 25% growth in sales.
We use the following formula to determine the quantum of External Financing Needed (EFN) to fuel additional growth, since the company is functioning at full capacity.

where
is current sales
is projected increase in sales
refers to Assets that vary directly with sales at time 0.
refers only to those liabilities that change directly with sales
NPM refers to the after tax (net) profit margin
b refers to retention ratio. This is also calculated as
We have:
Last year's sales $100 million
Projected Growth rate in sales 25%
Next Year's Sales 
Total Assets $121 million
Current Liabilities $52 million
We take only Current liabilities into account as the question states that all current liabilities vary with sales
Net Profit Margin 9%
Dividend Payout Ratio 30%
Retention Ratio
Substituting the values in the formula above we get,



