Exercise $10\mathrm{.}1\mathrm{.}1$: Suppose we make the following changes to the weights of

the edges in Fig. $10\mathrm{.}1.$ What would the resulting MWST be$?$

a$)$ Change the weight $10$ on edge $(1,3)$ to $25.$

b$)$ Instead, change the weight on edge $(2,4)$ to $16.$