The pie chart shows how electricity was generated in a region in 2025.
a.[2]
Which two energy resources generated the least electricity in 2025?
b.[2]
Estimate the percentage of electricity generated using hydroelectric power in 2025.
c.[3]
From 2025 to 2026, the percentage of electricity generated using solar power changed from 4.6% to 5.1%.
Calculate the percentage change in the use of solar power. Use the equation:
percentage change=new value−old valueold value×100% \text{percentage change} = \frac{\text{new value} - \text{old value}}{\text{old value}} \times 100\% percentage change=old valuenew value−old value×100%Give your answer to 1 decimal place.