The market for wheat in Elbonia can be represented by the following equations, where the price (P) is measured in dollars and the quantity Q is measured in metric tonnes.

P = 400 - Q

P = 50 + 4Q

1. Calculate the price elasticity of demand when price increases from $200 to $210

2. Calculate the price elasticity of supply when the price decreases from $170 to $150.

3. Will your answers change if I tell you that the quantity is measured in thousands of metric tonnes rather than just metric tonnes? Explain your answer.