profit ,discount,markup

profit=37.5% 

discount =20%

markup =?

discount =20/100=1/5 ---(1)

profit=37.5/100=3/8    ---(2)

therefore  from (2)

we can conclude 

for something worth 100 rs profit is 37.5rs

hence when scaled down something worth 8 rs will have profit of 3rs

so write the ratio

CP +  profit  =SP

8    + 3          =11

from equation (1)

for some item with marked price with 100rs will have discount of 20 rs

hence when scaled down item worth 5rs will have discount of 1rs

so,

MP - discount =SP

5     -1              =4

CP    profit  SP      MP  discount

8       3          11

                       4      5        1

-----------------------------------------

8*4   3*4       11*4  11*5  11*1

-------------------------------------------

32      12           44      55       11



55 rs