As explained in § 778.210 of this part, a true bonus based on a percentage of total wages—both straight time and overtime wages—satisfies the Act's overtime requirements, if it is paid unconditionally. Such a bonus increases both straight time and overtime wages by the same percentage, and thereby includes proper overtime compensation as an arithmetic fact. Some bonuses, however, although expressed as a percentage of both straight time and overtime wages, are in fact a sham. Such bonuses, like the bonuses described in § 778.502 of this part, are generally separated out of a fixed weekly wage and usually decrease in amount in direct proportion to increases in the number of hours worked in a week in excess of 40. The hourly rate purportedly paid under such a scheme is artificially low, and the difference between the wages paid at the hourly rate and the fixed weekly compensation is labeled a percentage of wage “bonus.”