Asmall technology firm can either produce computer keyboards or mice. the company has a limited number of workers, so it can only spend 400 hours per week making these products. the company makes a profit of $8 per keyboard and $5 per mouse. if each keyboard requires four hours of labor, and each mouse takes two hour of labor, which of the following is true about the number of hours that can be spent making keyboards (k) and mice (m)?