Mr. Chang received the better discount, his price was $25. less 10 percent (-2.50)=22.50
Mrs. Robinson purchased hers at $29.99 less 20 percent (-6.00) = 23.99
Mr. Chang received the better deal
520 CD's because of the 9 months and we add 30 time 9 we erase the 0 and multiply the 3 with the 9 it will be 27 right we add the zero because the originla number is 30
You can use a square plus b square equal C square to fijd each length . or you can memorize the special triangles or you can also do proportional problem. it all works