In a memory study, subjects are asked to memorize some content and recall as much as they can remember each day thereafter. Each day, Maximilian finds that he has forgotten $15 \%$ of what he could recount the day before. Lucy also took part in the study. The given graphs represent the percentage of content that Maximilian (gray) and Lucy (black) could remember after $t$ days. y-axis labels "days" and x-axis labels "recall percentage"

On each day, what percentage of the previous day's content did Lucy forget?

Please directly answer the question and provide the final value, e.g., 1, 2.5, 300.
Question: In a memory study, subjects are asked to memorize some content and recall as much as they can remember each day thereafter. Each day, Maximilian finds that he has forgotten $15 \%$ of what he could recount the day before. Lucy also took part in the study. The given graphs represent the percentage of content that Maximilian (gray) and Lucy (black) could remember after $t$ days. y-axis labels "days" and x-axis labels "recall percentage"

On each day, what percentage of the previous day's content did Lucy forget?

Please first conduct reasoning, and then answer the question and provide the final value, e.g., 1, 2.5, 300, at the end.
Question: In a memory study, subjects are asked to memorize some content and recall as much as they can remember each day thereafter. Each day, Maximilian finds that he has forgotten $15 \%$ of what he could recount the day before. Lucy also took part in the study. The given graphs represent the percentage of content that Maximilian (gray) and Lucy (black) could remember after $t$ days. y-axis labels "days" and x-axis labels "recall percentage"

On each day, what percentage of the previous day's content did Lucy forget?
