The following table is based on the margin analysis.

Which of the following statements is false?

Firm $x$ has the highest cost of goods sold for each sales dollar.

Firm X spends $10\%$ of its sales on R&D expense and SG&A expense.

Firm $x$ has the highest depreciation and amortization expense for each sales dollar.

Firm $Z$ has the highest mark$-$up for the product.

Firm Z spends $1\%$ of its sales on depreciation and amortization expenses.