First, we calculate the increase of 4%, that is:
[tex]i=\frac{68000\cdot4}{100}\Rightarrow i=2720[/tex]So, her salary increases by $2720, now we add it to her base salary, that is:
[tex]T=68000+2720\Rightarrow T=70720[/tex]From this, we have that her new salary is $70 720.