please help!!

Overall, Chester has However, $ X of this gain is from collectibles, which are taxed at a maximum rate of b. If Chester has taxable income (including the property transactions) of $378,400; what is the income tax regarding these transactions? He has a marginal tax rate of 32%. x If Chester has taxable income (including the property transactions) of $74,125, what is the income tax regarding these transactions? He has a marginal tax rate of 12%