Answer:
PED = - 1
Explanation:
The PED or price elasticity of demand measures the sensitivity of quantity demanded to changes in price level. It is calculated by taking the percentage change in quantity demanded, which results from a change in price level, and dividing it by the percentage change in price level.
PED = percentage change in Quantity demanded / Percentage change in price
PED = [(800 - 1000) / 1000] / [(12 - 10) / 10]
PED = - 1