I've been stuck on this problem all day and need help Solving it. Thanks so much!

Kane Manufacturing has a division that produces two models of grates, model A and model B. To produce each model A grate requires 3 pounds of cast iron and 6 minutes of labor. To produce each modelB grate requires 4 pounds of cast iron and 3 minutes of labor. The prot for each model A grate is $2.25, and the prot for each model B grate is $1.75. Available for grate production each day are 1000 pounds of cast iron and 19 labor? hours. Because of an excess inventory of model A grates, management has decided to limit the production of model A grates to no more than 180 grates per day. (a) Find the range of values that Resource 2 (laborihours) can assume. Ex sasx (b) For the current optimal solution to hold, constraint 3 (production of modei A grates) cannot be decreased by more than X grates per day