Условие:
The following data represent the total expenses of plastic factory:\nCommodity\tTotal expenses in the base period, thousand rubles\tThe change of the production volume, %\nLinoleum 3526 + 16.5\nImitation leather 1324 + 14.5\nFoam plastic 985 - 4.0\nFilm 794 - 22.0\nFind composite average quantity index.

