An empty rectangular container has a capacity of 88 ℓ and a height of 80 cm. At 7 a.m., Tap C is turned on to fill the container at a rate of 7 ℓ per minute for 17 minutes. After 12 minutes, Tap D is turned on to drain water from the container at a rate of 8 ℓ per minute for 6 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 
7 ℓ = 7000 cm³ 
8 ℓ = 8000 cm³ 
88 ℓ = 88000 cm³

Volume of water flowed in from Tap C
= 17 x 7000
= 119000 cm³

Volume of water from drained from Tap D
= 6 x 8000
= 48000 cm³

Volume of water left in the container
= 119000 - 48000
= 71000 cm³

Base area of the container
= 88000 ÷ 80
= 1100 cm² 

Height of water left in the container
= 71000 ÷ 1100
≈ 64.5 cm

Answer(s): 64.5 cm