To find out how much Mrs. Perez should write the check for, we need to subtract the amount she paid in cash from the total cost of the washing machine.
Total cost of the washing machine: $1,456.20
Amount paid in cash: $525.00
Now, calculate the balance:
\[ \text{Balance} = \text{Total cost} - \text{Cash payment} \] \[ \text{Balance} = 1,456.20 - 525.00 = 931.20 \]
Therefore, Mrs. Perez should write the check for $931.20.