To solve this problem, we need to identify the term that represents the difference between the amount borrowed and the amount repaid. This term is commonly known as the "balance" or "remaining balance."
Step 1: Define the Variables
Let \( A \) represent the amount borrowed and \( R \) represent the amount repaid. In this case, we have:
\[
A = 1000, \quad R = 300
\]
Step 2: Calculate the Balance
The balance \( B \) is calculated as the difference between the amount borrowed and the amount repaid:
\[
B = A - R
\]
Substituting the values:
\[
B = 1000 - 300 = 700
\]
Final Answer
The difference between the amount borrowed and the amount repaid is given by:
\[
\boxed{B = 700}
\]