Question

a radio is sold for rupees 3120 at a loss of 4%.what will be the gain or loss percent if it sold for rupees 3640

Answer 1

Let the CP=100
SP,given= 3120 at loss of 4%
So,CP=100-4
=96
we need CP
Then, 100/96ˣ3120
Will come, 3250 this is CP
Now, it is sold for 3640
Then, it is profit 
Profit %=P/CPˣ100
390/3250ˣ100
Profit%= 12%