30 random samples of high school students were asked if they played a sport for their high school. Each sample was 20 students. The dot plot represents the 30 random sample proportion

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?