Please help with A and B

Moana is a single taxpayer who operates a sole proprietorship. She expects her taxable income next year to be $250,000, of which $200,000 is attributed to her sole proprietorship. Moana is contemplating incorporating her sole proprietorship. (Use the tax rate a. Using the single individual tax brackets and the corporate tax rate of 21 percent, find out how much current tax this strategy could save Moana (ignore any Social Security, Medicare, or self-employment tax issues). (Round your intermediate calculations and final answer to nearest whole dollar amount.) b. How much income should be left in the corporation?