To find out how much Ms. Tanaka will earn for selling 12 televisions, we can substitute \( t = 12 \) into the equation \( 2,500 + 100t \).
\[ \text{Earnings} = 2,500 + 100(12) \] \[ \text{Earnings} = 2,500 + 1,200 \] \[ \text{Earnings} = 3,700 \]
Therefore, Ms. Tanaka will earn $3,700 for selling 12 televisions this month.