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