Traditional Culture Encyclopedia - Hotel franchise - Solve math problems online. A hotel has 30 single rooms. According to the forecast, when the price of each room is set at 100 yuan per day, all rooms can be rented. Price per room per day

Solve math problems online. A hotel has 30 single rooms. According to the forecast, when the price of each room is set at 100 yuan per day, all rooms can be rented. Price per room per day

23. 1)30-( 130- 100)÷ 10=30-3=27

2) When the price of each room is set at X yuan per day, the rental income of the hotel is 3,840 yuan.

x * 30-(x- 100)/ 10 = 3840

Solution: x= 160 or x=240.

A: When the daily room rate is set at 65,438+060 yuan or 240 yuan, the rental income of this hotel is 3,840 yuan.

24. 1) when t= 1, h=20-5= 15m.

2) Let h=0 and get 0=20t-5t?

Solution: t=0 or t=4.

So the two intersections of parabola and X axis are (0,0) and (4,0).

So the symmetry axis is t=2.

Because the opening of the image is downward, it is 0 < t < 2 when the fireworks rise and 2 < t < 4 when the fireworks fall.