• qais
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It is quite simple..see
(a) Let original price be X
8% VAT on Rs X
VAT=8% of Rs X
       Rs 0.08X
now,0.08X +X= 13500
       = Rs 12500
(b)similarly, here original price= 180/1.08
                                                  =Rs 166.7

hope this will help  :)