Question

on selling a mobile for 750 a shop keeper looses 10% for what amount should he sell it to gain 5?

Answer 1

As he has lost 10 percent.
If "x" is the actual cost of the mobile .
then

x= 750 + 750*10/100 (as the second term gives the amount decreased we                                           have to add 750 to find the actual value.)
x=750 + 75
x=825.

so 5 percent gain is y let us say

y=825 + 825*5/100
y= 825 + 41.25
y= 866.25

so at 5 percent gain it must cost 866.25