A bipartisan group of senators hammered out a deal this week that would offer students better rates in the short term but may assign higher rates in later years. Lower interest rates would persist through the 2015 academic year, then climb higher as they are linked to financial markets. Rates would be capped at 8.25 percent, however, for undergraduates; at 9.5 percent for graduate students; and at 10.5 percent for parents. This could be the final agreement in ongoing efforts to roll back a July 1 rate hike for subsidized Stafford loans that doubled the rates from 3.4 percent to 6.8 percent, adding about $2,600 to students’ education costs. The Consumer Financial Protection Bureau projected that Americans now owe more than $1 trillion in federal student loan debt, noting that this form of debt is growing faster than credit card debt. The U.S. government could make $50 billion this year off student loans, an estimate that could increase by as much as $21 billion if no deal is made to reduce interest rates on Stafford Loans.