Your portfolio consists of $125$ shares of CSH and $100$ shares of$$ EJH, which you just bought at $$$$10$ and $$$$25$ per$$ share, respectively.

a$.$ What fraction of your portfolio is invested in$$ CSH$?$ In$$ EJH?

b$.$ If CSH increases to $$$$14$ and EJH decreases to $$$$23,$ what is the return on your$$ portfolio?