Zack and Mandy are comparing results from a 2-day lab experiment. On Monday, Zack’s results showed that 0.891 of the particles were charged while Mandy’s results showed that 81% of the particles were charged. On Tuesday, Zack’s results showed that 0.776 of the particles were charged while Mandy’s results showed that 82% of the particles were charged. Who on what day had the greatest percentage of charged particles in their experiment?