A uniform magnetic field of 0.0250 T points vertically upward. Find the magnitude of the magnetic flux

Question:

A uniform magnetic field of 0.0250 T points vertically upward. Find the magnitude of the magnetic flux through each of the five sides of the open-topped rectangular box shown in FIGURE 23-31, given that the dimensions of the box are L = 32.5 cm, W = 12.0 cm, and H = 10.0 cm.
Figure 23-31