The formula for getting the accumulated amount(compounded) is;
A =P(1+r%)∧n
Where A = Acumulated amountÂ
      P = principle (deposit)
      r = interest rate and
      n = period
Since the interst is compounded quartly,Â
period = (5×4)-3 = 17
A = 7100(1+2.8/100)∧17
  = 7100×1.028∧17
  = 11,353.80
The money she will end up earning in interest on the cd = $11,353.80