Questions:

i$)$ What is the optimal $($minimal cost$)$ purchasing plan, given the suppliers and constraints

described above? What is the total cost of this plan?

ii$)$ BLS$$s energy needs depend on a number of factors. For example, the energy usage at data

centers is typically sensitive to fluctuations in outside temperature. How does the solution and

cost above change if the electricity required increases from $1225$ GWh to $1250$ GWh$?$ Or if the

electricity required decreases to $1200$ GWh$?$