When income is $100 per week, 10 gallons of gas is demanded. When income is $140 per week, 15 gallons of gas is demanded. The income elasticity of demand for gallons of gas equals:

The income elasticity if demand measures how responsive demand is to a change in income. It can be obtained by dividing the percentage change in quantity demanded by the percentage change in income.

In this question, the % change in quantity demanded is 50%. This is because there is a change of exactly half.

The percentage change in income is 40%. There is a rise from 100 to 140

The income elasticity is thus equals 50%/40% = 1.25

When income is ​$100 per​ week, 10 gallons of gas is demanded. When income is ​$140 per​ week, 15 gallons of gas is demanded. The income elasticity of demand for gallons of gas ​equals:

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When income is $100 per week, 10 gallons of gas is demanded. When income is $140 per week, 15 gallons of gas is demanded. The income elasticity of demand for gallons of gas equals: