Quality Heating Company Has the Following Liabilities at Year End

Quality Heating Company has the following liabilities at year end:
$\begin{array}{lr}\text { Notes Payable } & \$ 20,000 \\\text { Accounts Payable } & 15,000 \\\text { Unearned Contract Revenue } & 9,000 \\\text { Wages Payable } & 2,900 \\\text { Interest Payable } & 700 \\\text { Income Taxes Payable } & 1,500\end{array}$

a. Which of these accounts probably was created at the end of the fiscal year as a result of an accrual? Which probably was adjusted at year end? Explain your answer.
b. Which adjustments probably reduced net income? Which probably increased net income? Explain your answers.