For each of the following situations, what would be the impact on the sandwich-making plan and total cost? If it is possible to compute the new cost or sandwich-making plan, do so.
(a) The cost of ham sandwiches and the cost of ham and cheese sandwiches each decreases by $0.35.
(b) The cost of both ham and cheese sandwiches and cheese sandwiches increases by $0.60.
(c) The cost of tuna decreases by $0.10 per ounce.
(d) The availability of tuna increases by 10 ounces and the availability of ham decreases by 10 ounces.
(e) A 16-oz jar of mustard is sent by mistake instead of a 16-oz jar of mayonnaise.