JT $($single taxpayer$)$ is a software engineer who earns salary income as an employee, and also earns business income as the sole proprietor of a business that provides custom software development. In $2024,$ they earned $$320,000$ of salary income. Consider the following two possible scenarios for $2024$:

$$Scenario AScenario BSalary income$$320,000$$$320,000$Business income $($loss$)$$$50,000($$$330,000)$

Part A$.$ What are JT$\text{'}$s $2024$ net earnings for tax purposes$$in Scenario A$?$

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Part B$.$What are JT$\text{'}$s $2024$ net earnings for tax purposes$$in Scenario B$?$