An empty rectangular container has a capacity of 87 ℓ and a height of 116 cm. At 8 a.m., Tap N is turned on to fill the container at a rate of 9 ℓ per minute for 15 minutes. After 3 minutes, Tap P is turned on to drain water from the container at a rate of 7 ℓ per minute for 8 minutes. What is the height of the water level in the container in the end? Give the answer in 1 decimal place.
1 ℓ = 1000 cm³ 
9 ℓ = 9000 cm³ 
7 ℓ = 7000 cm³ 
87 ℓ = 87000 cm³

Volume of water flowed in from Tap N
= 15 x 9000
= 135000 cm³

Volume of water from drained from Tap P
= 8 x 7000
= 56000 cm³

Volume of water left in the container
= 135000 - 56000
= 79000 cm³

Base area of the container
= 87000 ÷ 116
= 750 cm² 

Height of water left in the container
= 79000 ÷ 750
≈ 105.3 cm

Answer(s): 105.3 cm