Power Supply and Requirement in India

Direction for questions 81 to 85: Answer the questions based on the following information available in the bar graph. The graph represents the annual supply and requirement of power in billion kWh in India in different years.

$\text{Power supply in India (kWh in billion)}$

• 1974-75: Requirement = $79$, Supply = $65$
• 1975-76: Requirement = $84$, Supply = $72$
• 1976-77: Requirement = $89$, Supply = $83$
• 1977-78: Requirement = $103$, Supply = $87$
• 1978-79: Requirement = $108$, Supply = $95$
• 1979-80: Requirement = $118$, Supply = $97$
• 1980-81: Requirement = $120$, Supply = $105$
• 1981-82: Requirement = $131$, Supply = $116$
• 1982-83: Requirement = $136$, Supply = $122$
• 1983-84: Requirement = $145$, Supply = $131$
• 1984-85: Requirement = $171$, Supply = $148$

What was the percentage increase in the supply of power from the start to the end of the given period?

What is the ratio of the availability of supply in 1976-77 to the requirement in 1983-84?