Question 877668
 Discount % =10% 

Given loss% 15% and S.P.=10.20
C.P.=SP*100/100-loss%
      =10.20*100/100-15
      =1020/85
     C.P. =12
Given profit % 12.5% and need to find marked price.
When C.P. and profit % are given then S.P.=CP* (100+Profit %) /100
=12*(100+12.5)/100
=12*112.5/100
S.P.=13.5
 Let x be the M.P 
When S.P. and Discount % are given,  M.P.=(S.P.*100)/100-Discount %
x=(13.5*100)/100-10
=1350/90
=15.
The marked price is 15.