solving for the licensing fees as a percentage of sales revenue

1. return on invested capital is equal to profit/ assets=

2. The Profit made purely because of licenses technology

3. The margin of profit that should rightfully go to the licensor of the profit made purely because of licenses fees is 55% so

4. Sales/ assets ratio=

5. Licensing fees as a percentage of sales revenue will then be equal to the answer of 3 above divided by the answer of 4 above =

So the answer is 9% of sales revenue should be the licensing fees