Come$-$Clean Corporation produces a variety of cleaning compounds including Grit $337$ and Sparkle silver polish. Grit $337$ is a coarse cleaning powder that costs $$1\mathrm{.}20$ a pound to make and sells for $$11\mathrm{.}00$ a pound. A small portion of Grit $337$ is combined with several other ingredients and further processed into Sparkle silver polish. The silver polish sells for $$6\mathrm{.}00$ per jar.

This further processing requires one$-$fourth pound of Grit $337$ per jar of silver polish. The additional variable manufacturing costs per jar of silver polish are:

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