A tire store has a monopoly on tire sales in a small town. They want to increase sales from 25 to 26 sets of tires. In order to sell more sets of tires they need to lower their price from $700 to $650 a set. Marginal revenue for the 26th set of tires is: Selected answer will be automatically saved. For keyboard navigation, press up/down arrow keys to select an answer. a $600 b -$600 c $650 d -$650 e $700 f -$700 g $1,350 h -$1,350