Explanation:

Elasticity is more than One (Ed > 1):
When demand is elastic, a fall in the price of a commodity results in increase in total expenditure on it. On the other hand, when price increases, total expenditure decreases. It means, in case of highly elastic demand, price and total expenditure move in the opposite directions.
Elasticity is less than One (Ed < 1)
When demand is inelastic, a fall in the price of a commodity leads to fall in total expenditure on it. On the other hand, when price increases, total expenditure also increases. It means, in case of less elastic demand, price and total expenditure move in the same direction.
Elasticity is equal to One (Ed = 1):
When demand is unitary elastic, a fall or rise in the price of the commodity does not change the total expenditure. It means, total expenditure will remain unchanged in case of unitary elastic demand.
Total Expenditure Method:

Price Elasticity of demand can also be calculated by Total Expenditure Method. This method was suggested by Prof. Marshall. This method is also known as Total Outlay or Total Revenue method. Under this method, price elasticity is measured by comparing Total Expenditure (TE) on the commodity before and after the change in price.