Power Supply and Requirement Bar Graph

Question 1

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

Accepted Answer

D. Supply in 1974-75 = 60 billion kWh. Supply in 1984-85 = 140 billion kWh. Percentage increase = $\frac{140 - 60}{60} 	imes 100 = \frac{80}{60} 	imes 100 = 133.33\%$. Since $133.33\%$ is not among options (a), (b), or (c), the answer is 'None of these'.

Question 2

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

Accepted Answer

C. Supply in 1976-77 = 70. Requirement in 1983-84 = 140. Ratio = $\frac{70}{140} = 0.50 \approx 0.51$ (or using precise values from chart scale).

Year	Requirement (billion kWh)	Supply (billion kWh)
1974-75	70	60
1975-76	75	65
1976-77	80	70
1977-78	95	75
1978-79	100	85
1979-80	110	90
1980-81	115	95
1981-82	125	105
1982-83	135	115
1983-84	140	125
1984-85	165	140

Power Supply and Requirement Bar Graph

Passage / data set

Question 1 of 2

Explanation

Question 2 of 2

Explanation

Practise this under exam conditions