Luigi owns an Italian restaurant. He has experienced a few problems with recent deliveries from his suppliers and he seeks your advice.
(a) He orders 500 tins of Italian tomatoes. The supplier delivers 400 tins of Italian tomatoes and 100 tins of Greek tomatoes.
(b) He orders 10 kg of parmesan cheese, but the supplier delivers only 2 kg.
(c) He orders 50 kg of spaghetti. The supplier delivers 100 kg.
(d) He has a regular order with a local baker for 100 bread rolls to be delivered by 11 am every day. On one occasion the rolls do not arrive until 2 pm.