The following are the values of a time series for the first four time periods: 
Using a four-period moving average,the forecasted value for time period 5 is:
Definitions:
Price Elasticity
An economic concept that measures how the quantity demanded of a good changes in response to a change in its price.
Price Elasticity of Demand
A measure of how much the quantity demanded of a good responds to a change in the price of that good.
Elastic
A term often used in economics to describe a situation where the demand for a product or service significantly changes in response to a change in price.
Pricing Strategy
An approach businesses use to set the prices for their products or services, based on costs, market demand, competition, and other factors.
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