a company that manufactures light bulbs uses both capital (c) and labor (l) in its production process. it's trying to maximize its profit, and can produce any number of light bulbs it wants to. currently, for the last unit of labor used, the mrp(l) is $18 and the p(l) is $6. for the last unit of capital used, the mrp(c) is $5 and the p(c) is $10. in order to become more profitable, which is true?