An empty rectangular tank has a capacity of 112 ℓ and a height of 100 cm. At 8 a.m., Tap K is turned on to fill the tank at a rate of 9 ℓ per minute for 18 minutes. After 3 minutes, Tap L is turned on to drain water from the tank at a rate of 4 ℓ per minute for 12 minutes. What is the height of the water level in the tank in the end? Give the answer in 1 decimal place.
1 ℓ = 1000 cm³ 
9 ℓ = 9000 cm³ 
4 ℓ = 4000 cm³ 
112 ℓ = 112000 cm³

Volume of water flowed in from Tap K
= 18 x 9000
= 162000 cm³

Volume of water from drained from Tap L
= 12 x 4000
= 48000 cm³

Volume of water left in the tank
= 162000 - 48000
= 114000 cm³

Base area of the tank
= 112000 ÷ 100
= 1120 cm² 

Height of water left in the tank
= 114000 ÷ 1120
≈ 101.8 cm

Answer(s): 101.8 cm