To determine how much Mya has spent so far, you can calculate \( \frac{4}{5} \) of her monthly budget of $300.
Here's the calculation:
\[ \text{Amount spent} = \frac{4}{5} \times 300 \]
First, multiply 300 by 4:
\[ 4 \times 300 = 1200 \]
Now, divide 1200 by 5:
\[ \frac{1200}{5} = 240 \]
So, Mya has spent $240 of her food budget so far.
To find out how much she has left, subtract her spent amount from her total budget:
\[ \text{Amount left} = 300 - 240 = 60 \]
Mya has $60 left in her food budget for the month.