Q$3.,$ ABC, an IT Company, has been operating in Europe since $2010.$ Following is a three different product sales figures in $2021$ and $2022,$ and average profits in that period of time as percent $(\%).$ Having computed price changes in $2022$ relative to $2021($base year$=100),$ find and interpret the weighted composite sales index for those $3$ products of Company ABC.

$\backslash$table$[[\backslash$table$[[$PRODUCTS IN$],[$EUROPE$]],$SALES $($Number of Items sold $/00000),\backslash$table$[[$AVERAGE PROFIT$],[($Product Based $/\%)]]],[2021,2022],[$B$,3,4,10],[$C$,1,3,2]]$