To determine the amount of supplies used during the year, we need to calculate the difference between the total supplies available and the supplies remaining at the end of the year. The total supplies available is the sum of the beginning balance and the supplies purchased during the year. The supplies used is then the total supplies available minus the supplies remaining.
To find the total supplies available during the year, we add the beginning balance of supplies to the supplies purchased during the year. Mathematically, this is expressed as:
\[
\text{Total Supplies} = \text{Beginning Balance} + \text{Purchased Supplies}
\]
Substituting the given values:
\[
\text{Total Supplies} = 800 + 2100 = 2900
\]
To determine the supplies used during the year, we subtract the supplies remaining at the end of the year from the total supplies available. This can be expressed as:
\[
\text{Supplies Used} = \text{Total Supplies} - \text{Remaining Supplies}
\]
Substituting the calculated and given values:
\[
\text{Supplies Used} = 2900 - 650 = 2250
\]