How do I work this one with Excel

A benchmark index has three stocks priced at $$23,$$$43,$ and $$56.$ The number of outstanding

shares for each is $350000$ shares, $405000$ shares, and $553000$ shares, respectively. Suppose the

price of these three stocks changed to $$23,$$$51,$ and $$58$ and number of outstanding shares did not

change, what is the price$-$weighted index return?

$8\mathrm{.}20\%$