When the price of each room is 14 yuan per day, the daily income is100 *14 * 65% = 910 yuan.
When the daily price per room is 12 yuan, the daily income is 100* 12*75% = 900 yuan.
When the daily room rate is 10 yuan, the daily income is 100* 10*85% = 850 yuan.
The answer is b 14.
Question 1: Explain the origin of the number "zero"; (1) explained the meaning of "zero" and (1) verified the difficulty of "zero