Answer:
let marked prize=mp
discount=10%
sp=mp-d%ofmp=mp(1-10/100)=0.9mp
vat=15%
- sp with vat=sp+vat%of sp=sp(1+15/100)=1.15sp=1.15×0.9mp=1.035mp
- sp with vat=1.035mp
- 16720=1.035mp
- mp=16720/1.035=16154.589
- discount amount=d%of mp=10%×16154.589=rs1615.458