Two competitive websites have recently been promoting their beverage delivery services, Phil's sites purchased banner ad receiving 16,000 impressions. Stu used search engine advertising that was viewed 16,100 times produced 286 clicks. Stu paid an average of $1.53 per click. Phil's banner ads yielded clickthrough rates of 1.44% and 20% of those visits resulted in an order. The banner ads costs for Phil's campaign were $447. Stu recorded 22 purchases from clicks produced by his search engine advertising.

1. What is Stu's clickthrough rate?
2. How many clicks did Phil's advertisement generate?
3. What is Phil's cost per click of those responding to the advertisement?
4. What is Phil's cost per order?