day_income = (db["workday_minutes_worked_1"] / 60.0) * db["workday_hourly_rate_1"]
day_income += (db["workday_minutes_worked_2"] / 60.0) * db["workday_hourly_rate_2"]
day_income += (db["workday_minutes_worked_3"] / 60.0) * db["workday_hourly_rate_3"]
day_income = (db["workday_minutes_worked_1"] / 60.0) * db["workday_hourly_rate_1"]
day_income += (db["workday_minutes_worked_2"] / 60.0) * db["workday_hourly_rate_2"]
day_income += (db["workday_minutes_worked_3"] / 60.0) * db["workday_hourly_rate_3"]