Consider the economic dispatch problem for a power plant having two generating units. The fuel costs in Rs/MWh along with the generation limits for the two units are given below:
C₁ (P₁) = 0.01P₁² + 30P₁ + 10; 100MW ≤ P₁ ≤ 150MW
C₂ (P₂) = 0.05P₂² + 10P₂ + 10; 100MW ≤ P₂ ≤ 180MW
The incremental cost (in Rs/MWh) of the power plant when it supplies 200 MW is _____.