Which formula is used to forecast future prices using an index?

The formula used to forecast future prices using an index typically involves adjusting a price from a base period according to the new index value. The correct option applies this adjustment by multiplying the price in the base period by the new index value and then dividing by 100. This method translates the base period price into a future price that reflects changes in the index, which often tracks inflation or other economic factors influencing price levels.

By utilizing the new index value in this way, it provides an accurate reflection of how much a price should adjust over time based on current economic conditions. This calculation is essential for maintaining consistent pricing strategies in business and ensuring that historical pricing remains relevant when forecasting future financial expectations.

The other options present formulas that do not directly apply to forecasting future prices based on an index, either by not properly adjusting prices with the indices or by misrepresenting the relationship between pricing and index values.