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A basis of 30/360 for U.S. corporate bonds means that Every coupon period has 360 days The actual number of day in each coupon period is used Every coupon period has 180 days The actual number of days in each month is used Every month has 30 days A basis of 30/360 for U.S. corporate bonds means that Every coupon period has 360 days The actual number of day in each coupon period is used Every coupon period has 180 days The actual number of days in each month is used Every month has 30 days