一件商品售价为210元,现降价30%出售,现价为63元.______.
210×(1-30%),
=210×70%,
=147(元);
147≠63;
故答案为:错误.
A certain tire company can produce tires at a cost of $22,500 per batch plus $9 per tire. The company can sell tires to the wholesaler at a cost of $20 per tire. If a batch of 15,000 tires is produced and sold, what is the company’s profit per tire ?()
A. $9.00
B. $9.50
C. $11.00
D. $13.50
E. $20.00
关系操作的特点是( )。