I think this question is still missing some data. I think they should have given more data about the final price after the two sets of discount.
Just a trick i will share if you don't know already...

When there are two successive percentage changes P1 & P2.. the ultimate overall percentage change is ...

\(P_final = P1 + P2 + (P1*P2/100)\)

So in this particular case \(P1 = -60 & P2 = -20\)

P_final = -60 - 20 + (-60)*(-20)/100
= -80 + 12
= -68 % (Overall decrease)

So if the initial price was $ 100 now it should be $ 32.

Hope this helps. But still the question you said is incomplete.