# How would you calculate the Price Elasticity of Demand if the Prices are constant, given that there is change in quantity demanded?

I have data that I have collected suggests that the prices are more or less constant throughout the month whereas the quantity demanded changes on a day to day basis. Recalling the formula for PED, we can write:

$$PED= {P*\Delta Q \over Q*\Delta P}$$ we can observe that $\Delta P=0$ as I mentioned earlier, giving us $PED=infinity$. However in reality the demand is inelastic. Is there a way to handle this error?

Assumption while measuring the prices: The supply was constant.

These are tuples of the form (Price and Demand)

(275,30)

(275,80)

(275,20)

(275,70)

(282,0)

(282,50)

(282,100)

(282,80)