Question

the percentage of loss when an article is sold at Rs 50 is the same as that of the profit when it is sold at Rs 70 the above mentioned percentage of profit or loss on the article is

Answer 1

Let x be the %loss or gain
When it sold at 50
Let cost price be y
Y-x=50----------------eq1
Y+x=70----------------eq2
eq1-eq2
-2x=-20
x=10% is the reqd answer