<｜begin▁of▁sentence｜>### Instruction:
As a Pharmaceutical Sales Representative, you are visiting a hospital to present a new medication to the medical staff. During your presentation, a doctor mentions that they have been manually tracking medication usage using two separate Excel sheets, complicating their workflow. The doctor requests your assistance in merging the data into a single sheet to streamline the process.

In this scenario, you have the opportunity to integrate the data and demonstrate the process of using the NumPy API to perform an in-place addition of the second matrix to the first matrix, showcasing how advancements in technology can simplify tasks.
### Response:
import numpy as np

# Define two matrices using NumPy
A = np.matrix([[1, 2], [3, 4]])
B = np.matrix([[5, 6], [7, 8]])

# Perform in-place addition of matrix B to matrix A
A += B

# Print the modified matrix A
print(A)
<|EOT|>
