Porter earns $8 per day and works 5 times a week. His manager is asking him to work an extra day that promises him an extra fifty percent on top of his daily rate. How much money will he earn after a month if he renders overtime every week? Let's think first. Chain of thought:
Porter's weekly earning is $8x5 = $40. Porter's monthly earning is $40x4 = $160. The extra amount he will earn when he works on his overtime is $8 x 50 / 100 = $4. So the amount he will earn on his overtime is $8 + $4 = $12. Since he will render overtime once every week, the total overtime pay he will earn in a month is $12 x 4 = $48. Therefore the total money he will earn in a week is $160 + $48 = $208.
Therefore, the answer is 208.