Question 60949
Let R = Margarita's annual raise.
Then, {{{60000 + 3R = 70500}}}
Or, {{{3R = 70500-60000 = 10500}}}
So, {{{R = 10500/3 = 3500}}}

t is the number of years she's worked.
Her annual salary, S, = {{{60000 + 3500*t}}}

After 12 years her annual salary, S, = {{{60000 + 3500*12}}} = {{{60000 + 42000}}} = {{{102000}}}