► cost something per minute/hour/year etc· Calls cost only 2p per minute.
► cost something per person· There’s a one-day course that costs £80 per person.
► cost something per head (=per person)· The meal will cost about £20 per head.
► 50%/100 per cent etc cotton· These lightweight trousers are made from 100% cotton.
► $15/5 grams/50 etc per day (=used when saying how much someone earns or is paid each day)· They get about £45 per day.
► miles per gallon
The car does about 50 miles per gallon. ► miles per hour
He was driving at 70 miles per hour. ► per second
Ultrasonic waves travel at around 300 metres per second.