Aradio dealer makes a radio with the price 20% above the cost price and allows 10% discount on it. find his gain percent

Good morning,

Step-by-step explanation:

Let x be the cost price and

     y the final sell price

     p gain percent

the gain precent p = (20/100)-(10/100)-[(20×10)/(100×100)]

                               = (20-10)/100 - 2/100

                               = 10/100 - 2/100

                               = 8/100

example : x=20

x(1+20/100)(1-10/100) = 20(1+20/100)(1-10/100) = 20(120/100×90/100)

                                                                           = 20(10 800÷10 000)

                                                                           = 21.6

20+20p% =21.6 then 20p%=1.6 then p%=1.6/20=16/200=8/100 then p=8.

for more details look at the photo below.

:)

x=0

step-by-step explanation:

step-by-step explanation: