Tenant has 3 extra people in unit - how much do I charge?

[Amanda Dehaas]

My tenant signed a lease stating only 2 will reside in the 2BD/1BA unit and Guests are allowed for only 5 days per month unless they have written permission from the landlord. What do I charge them in the event the extra three people (2 adults, 1 baby) stay for longer than 5 days? Should I cap it at a 30 day stay? What has anyone else done in the past?