$$120,000$ new machine, savings $=$ $$30,000$ per yr $($old machine maintenance$)$ net $$12,000$ per yr $($new machine maintenance$)$;

salvage value of old machine $=$ $$40,000$; new machine expected life $=10$ with no salvage value.

$1)$ Depreciation Expense per yr of new machine?

$2)$ Incremental annual net operating income from new machine?

$3)$ Initial Investment used to calculate Simple Rate of Return $($this is an accounting return including depreciation expense$)?$

$4)$ Simple Rate of Return?