You decide to look closer at HealthCo’s current-year tax reconciliation footnote. The table reports $35 million in statutory taxes, a $5 million credit for manufacturing investments, and a one-time tax expense of $10 million related to a past-year audit. Reported taxes are therefore $40 million. What is HealthCo’s statutory tax rate, operating tax rate, and effective rate? Why does computing the operating tax rate require judgment?