You have the following information for two stocks that make up a stock index.

a$.$ Compute the percentage change from open to close in each stock's value. $-10\mathrm{.}00\%$;$20\mathrm{.}00\%$

b$.$ Compute the percentage change in the stock index that is made up of these two stocks assuming

the index is a price$-$weighted index $($PWI$).1\mathrm{.}25\%$

c$.$ Compute the percentage change in the stock index that is made up of these two stocks assuming

the index is a value$-$weighted index $($VWI$).6\mathrm{.}36\%$