please help with all 4 parts

Different loan rates. Winthrop Enterprises is a holding company (a firm that owns all or most of some othercompanies' outstanding stock). Winthrop has four subsidiaries. Each subsidiary borrows capital from the parent company for projects. Ervin Company is successful with its projects 85% of the time, Morten Company 87% of the time, Richmond Company 73% of the time, and Garfield Company 83% of the time. What loan rates should Winthrop Enterprises charge each subsidiary for loans?

What loan rate should Winthrop Enterprises charge Ervin Company for loans?

What loan rate should Winthrop Enterprises charge Morten Company for loans?