1. The area of the bedroom except the ground is 4×3+2×4×2.7+2×3×2.7=49.8 square meters.

2. The window area is 1.8× 1.5=2.7 m2.

3. The area of the door is 0.9× 2.1=1.89m2..

4. The area to be painted with latex is 49.8-2.7-1.89 = 45.25438+0m2.

5. The volume of latex used for * * * is 0.61× 45.21= 27.55438+0 liter ≈27.6 liter.