PVBP and Money Duration

Hellon everyone, can someone help me out in the calculations relating to PVBP and Duration

As per my understanding

Money Duration = Modified duration x Market value of the bond Money Duration = PVBP x 100

Now coming to Reading 23 Example 4 to calculate the MV of the portfolio the curriculum divides the Money Duration by PVBP instead of dividing it by Modified Duration according to the equation (Money Duration = Modified duration x Market value of the bond). Can anyone please help me out with this Example 4. thanks