Please help with formula and workings :

Practice Question $1$:

A portfolio consists of the following stocks.

a$)$ Calculate the expected portfolio return.

b$)$ Investor wants to rebalance the portfolio and sets a ceiling $($max$.$ weight$)$ for the Yellow stock to be $40$ percent by shifting the balance to the Green stock. Calculate portfolio return with the new limits for the Yellow stock and comment on the risk appetite of the investor. Has it gone up or down?

$\backslash$table$[[$Name$,$No$.$ of shares held,Current Price,Expected Return$],[$Red$,440,000,12\mathrm{.}00,9\mathrm{.}5\%],[$Blue$,660,000,12\mathrm{.}75,15\mathrm{.}5\%],[$green$,2,200,000,15\mathrm{.}00,7\mathrm{.}5\%],[$Yellow$,33,000,000,3\mathrm{.}50,21\mathrm{.}0\%],[$Orange$,880,000,10\mathrm{.}00,16\mathrm{.}0\%],[$Black$,1,540,000,9\mathrm{.}00,14\mathrm{.}5\%]]$