hello, can you please check my work. i am working in accounting mangerial. thank you .

The profit margin is the ratio of

a.sales to invested assets

b.income from operations to sales

c.income from operations to invested assets

d.assets to liabilities

I say its d.( sales - expense.)

Which of the following is a measure of a manager's performance working in an investment center?

a.residual income

b.return on investment

c.divisional income statements

d.All of these choices are correct.

For this one it would be D. (things works)