5mathematicsx90v0="5X900=4500"
3physicsx700="3X700=2100"
8chemistryx650="8X650=5200"
10biologyx500="10X500=5000"
Total cost =(4500+2100+5200+5000+4800)=21600
Sub-take cost= "21600\/2=10800"
Actual cost="21600X100\/105=20571.48"
VAT= "21600-20571.43=1028.57"
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