In addition to price$-$weighted and value$-$weighted indexes, an equally weighted index is one in which the index value is computed fro the average rate of return of the stocks comprising the index. Equally weighted indexes are frequently used by financial researchers measure portfolio performance.

The following three defense stocks are to be combined into a stock index in January $2019($perhaps a portfolio manager believes the stocks are an appropriate benchmark for his or her performance$)$:

$\backslash$table$[[,,$Price$],[,$Shares,,,$],[,($millions$),\frac{1}{1}\frac{?}{19},\frac{1}{1}\frac{?}{20},\frac{1}{1}\frac{?}{21}$

What is the rate of return ok the index for $2020?$