Provide the full names and emails of customers whose payments were greater than 70% of the average.
full name refers to first_name, last_name; average payment refers to AVG(amount); payments were greater than 70% of the average refers to amount > (AVG(amount) MULTIPLY 0.7)
SELECT DISTINCT T2.first_name, T2.last_name, T2.email FROM payment AS T1 INNER JOIN customer AS T2 ON T1.customer_id = T2.customer_id INNER JOIN address AS T3 ON T2.address_id = T3.address_id WHERE T1.amount > ( SELECT AVG(amount) FROM payment ) * 0.7