I want to find out how many pints are in one liter, and I know that 0.5 liters is approximately 1.05 pints. That means that one liter is twice as much as 0.5 liters, so I can multiply both sides of the equation by 2 to get the conversion factor for liters to pints. Multiplying by 2, I get that one liter is approximately 2.1 pints. To express this as a decimal to the nearest tenth, I just need to round 2.1 to the nearest tenth, which is already 2.1. 
Given that 0.5 liters is approximately 1.05 pints, how many pints are in one liter? Express your answer as a decimal to the nearest tenth.