For the first sale commission earned =4.5/100×15000=R675=4.5/100\times 15000=R675=4.5/100×15000=R675
Sales above R200000=500000-200000=R300000
commissioncommissioncommission =7/100×300000=R210007/100\times 300000=R210007/100×300000=R21000
total commission =21000+675=R21675