Saundra room is 15 ft long by 9 feet wide. She is putting carpet in the room and cost $3.75 per square foot how many how much will it cost to put carpet in Sandra's room

Ateacher wanted to buy a chair, a bookshelf, two tables and a desk. she spent $900 for all five items and the chair and the desk combined 70% of her total. if the bookshelf cost $50, how much did each of the tables cost?