In 2021, Archibald Corporation incurred the following expenses in connection with the product of its business: P100,000 worth of plane tickets and hotel bills of its employees who were sent to business seminars; P200,000 transportation allowances of its officers from home to office and vice versa as part of their employment contract; P80,000 transportation expenses of messengers from office to several clients; P20,000 special assessment. Determine the allowable expenses that could be deducted by Archibald Corporation from its gross income.