A classroom's population went from 25 to 46 in 15 years. What was the percent of change? a
21%
b
84%
c
16%
d
80%

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?