To find out how much Ms. Tanaka will earn for selling 12 televisions this month, we can use the formula provided:
\[ \text{Earnings} = 2,500 + 100t \]
Where \( t \) represents the number of televisions sold.
Plugging in \( t = 12 \):
\[ \text{Earnings} = 2,500 + 100 \times 12 \]
Calculating the variable part:
\[ 100 \times 12 = 1,200 \]
Now, substituting back into the equation:
\[ \text{Earnings} = 2,500 + 1,200 = 3,700 \]
Thus, Ms. Tanaka will earn $3,700 for selling 12 televisions this month.