This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
SP=Rs 270, loss=10%
Solving it in Unitary Method we get,

If CP is Rs100, then SP is Rs90,
If SP is Rs90, then CP is Rs100,
If SP is Re1, then CP is Rs \frac{100}{90} ,
If SP is Rs270, then CP is Rs \frac{100}{90} ×270

By cancelling the terms,
 we get then CP as Rs 300,

Now, CP=Rs 300, SP=Rs 360
Gain= Rs(360-300)= Rs 60

Gain%= ( \frac{Profit}{CP}  ×100)%
          =( \frac{60}{300} ×100)%
Let C.P. be x
                   Therefore, Loss = (10% of x)
                  Therefore,S.P. = C.P.- Loss
By the Problem,
                     270 =9x÷10
Therefore, C.P. = 300

If the man sold it at 360,
                           Amount he would gain = His Profit
                                                            = 60
                          His Gain% ={ (60÷300)×100}%
                                          = 20%