Calculate the percentage of businesses who located in Mesa. What is attribute value of these businesses.
percentage = divide(count(business where city = 'Mesa'), count(business)) * 100%
SELECT CAST(COUNT(T1.city) AS REAL) * 100 / ( SELECT COUNT(business_id) FROM Business ), T2.attribute_value FROM Business AS T1 INNER JOIN Business_Attributes AS T2 ON T1.business_id = T2.business_id WHERE T1.city = 'Mesa'