8 units of a good are demanded at a price of Rs 7 per unit

8 units of a good are demanded at a price of Rs 7 per unit. Price Elasticity of Demand is (-) 1. How many units will be demanded if the price rises to Rs 8 per unit.Use expenditure approach of Price Elasticity of Demand to answer this question.

Given, {{E}_{d}} =-1
In this case, when Elasticity of Demand is (-) 1, total, expenditure will remain constant, Total expenditure does not change.When price is Rs 8 per unit,
Quantity demanded = TE/P = 56/8=7 units