$\backslash$table$[[$Ingredient$,$Beginning,Ending,$\backslash$table$[[$Quantity $($pounds$)],[$per $100$ Pounds of Product$]]],[$A$,2\mathrm{.}50,3\mathrm{.}95,25],[$B$,8\mathrm{.}75,9\mathrm{.}90,15],[$C$,0\mathrm{.}99,0\mathrm{.}90,50]]$

$($a$)$ Compute the price relatives for the three ingredients.

$\backslash$table$[[$Item$,$Price Relative$],[$A$,],[$B$,],[$C$,]]$

$($b$)$ Compute a weighted average of the price relatives to develop a one$-$year cost index for raw material

$I=11$

What is your interpretation of this index value?

Cost of raw materials is up $\%$ for the chemical.