I NEED TO MAKE THIS EQUATION FOR THE AREA IN CAMDUCT 

IN ITEM LIST REPORT I NEED THE CAM DUCT PROGRAM TO CALCULATE OUTPURT DUCT AREA AS :

LESS THAN 0.5 SQM WILL BE EQUAL TO 0.5 SQM 

AND THE AREA BETWEEN 0.5 SQM AND 1 SQM TO BE CALCULATED AS 1 SQM

KINDLY REVIEW AND GIVE ME YOUR KIND SUPPORT