let's say shopkeeper sells both items for the price of x.

if price x gives 10% profit then the original price must be 100x/110 = 10x/11
if price x gives 10% loss then the original price must be 100x /90 = 10x/9

original cost of both products combined = (10x/11 + 10x/9) = 200x/99
but the shopkeeper is selling both items for 2x

so the loss (*note 200x/99 is more than 2x) = 200x/99 - 2x = 2x/99

so percentage loss = (( 2x/99 )/( 200x/99))*100 = (2x/200x)*100 = 1% loss

what is OA?

Hope this helps...

You are right , Plz solve my work-rate topic unanswered 2nd and 3 rd questions

Done