We need a iphone/ipad app developer

We need to develop an iphone/ipad app developer to make a rental checkout / checkin app to calculate cost of an item rental. rental rate is $8 for the first 10 minutes and then $0.50 per minute after the first 10 minutes. The app should also send an email to predefined email addresses with the checkout time, checkin time, rental hours & minutes and rental charge.