What is the id of the project that has the highest optional tip? Indicate the names of the resources that were requested.
highest optional tip refers to subtract(total_price_including_optional_support, total_price_excluding_optional_support); names of the resources refers to item_name
SELECT T1.projectid, T1.item_name FROM resources AS T1 INNER JOIN projects AS T2 ON T1.projectid = T2.projectid ORDER BY T2.total_price_including_optional_support - T2.total_price_excluding_optional_support DESC LIMIT 1