5a: Now we will clean the variable that measures how often the respondent ate fruit per day or per week or per month. Create a new variable in `brf_part1` named `FRTDAY` that converts all of the responses into fruits eaten *per day*. Be sure to account for 0 days. Use 30 days per month, 7 days per week, and 0.02 for less than once a month in your conversion calculations. Place the new column as the first column in the dataframe