hi,

suppose the cost price of article is x rs.

susma sells it 12% loss, so the selling price is = x-x*12%= x-12x/100= 88x/100.

now if he would sell it for 8% profit, than the selling price would be x+x*8%=108x/100.

now,

(88x/100)  + 50.80 = 108x/100.

solve the above equation, you can get the value of x which is the cost price of the article.