There's other solutions posted but none of them appear to work for me. I need the work for Freshman and Sophomore year please.

Required information For many years, college costs (including tuition, fees, and room and board) increases have been higher than the inflation rate, averaging 5% to 8% per year. According to the College Board's Trends in College Pricing, the average total costs at present in dollars is $21,500 for students attending in-state four-year public colleges and universities and $44,250 for students at four-year private colleges and universities. Assume an additional $5,000 per year for textbooks, supplies, transportation, and other expenses. Using a 7% per year inflation rate, how much can a sophomore high-school student expect to spend on in-state tuition, fees, and room and board for the freshman year (3 years from now) at a four-year public university? A sophomore high-school student is expected to spend $ D for the freshman year