Answer:
Year 1:
total income before charitable contributions = $250,000
limit on charitable contributions = $250,000 x 10% = $25,000
taxable income after charitable contributions = $250,000 - $25,000 = $225,000
charitable contributions carried forward = $30,000 - $25,000 = $5,000
Year 2:
total income before charitable contributions = $300,000
limit on charitable contributions = $300,000 x 10% = $30,000
taxable income after charitable contributions = $300,000 - $15,000 - $5,000 = $280,000