Our interface is using a slider which allows users to alter a price from a preset recommended price.
Alongside this we are showing the recommended price, the new altered price and, by request of the users, we are also showing the percentage increase or decrease.
Does anyone know if it would better to show this percentage increase as:
- The recommended price as 100% so any increase would be above 100% e.g. 110%, any decreases would be below 100% e.g. 90%, or;
- The recommended price as 0% so any increase would be above 0 e.g. +10%, any decreases would be below 0% e.g. -10%.
Which method would be more user friendly and aid usability?