Answer
$$ 0.92 \space kg $$
Work Step by Step
$$100\% \space sunscreen = 2.50 \% \space benzyl \space salicylate$$ $$1 \space tube = 4.0 \space ounces \space ( sunscreen)$$ $$1 \space lb = 16 \space oz$$ $$2.20 \space lb = 1\space kg$$
$$325 \space tubes \times \frac{4.0 \space oz(sunscreen)}{1 \space tube} \times \frac{2.50 \% \space (benzyl \space salicylate)}{100 \%(sunscreen)} \times \frac{1 \space lb}{16 \space oz} \times \frac{1 \space kg}{2.20 \space lb} $$ $$ = 0.92 \space kg (benzyl \space salicylate)$$
