Martina is single and has two children in college. Matthew is a sophomore and Christine is in her fifth year of college. In 2020, Martina pays $3,600 in tuition and fees for Matthew, $700 for textbooks, and $2,000 for his room and board. Christine's tuition and fees are $4,800, her textbooks are $550, and her room and board expenses are $1,800. Martina's adjusted gross income is $63,000. a. Martina can claim $ X as a tax credit for the higher education expenses. Feedback Check My Work Eligible taxpayers who incur expenses for higher education can elect to claim one of two tax credits. b. Assume that Martina's adjusted gross income is $83,000, then she can claim $ as a tax credit for the higher education expenses