Answer and Explanation:
The computation is shown below;
But before reaching to the final answers, first do the following calculations
Cash collected $108000 
Add Services performed in 2017(not collected) $36000 
less Services performed in 2016(collected in 2017) $25000 
Revenue for 2017 $119,000 
Cash paid in 2017 $72,000 
Add Expense incurred not yet paid for 2017 $42000 
Less Expense paid for 2016 -$30000 
Expense for 2016 $84000 
Now 
 a. Cash basis 
Revenue $108000 
Less Expenses -$72,000 
Net income $36000 
b. Accrual basis 
Revenue for 2017 $119,000 
Less Expenses for 2017 $84,000 
Net income $35,000