Question

Mr. a bought a shirt for rs. 350. for how much shall he sell it so as to gain 20%

Answer 1

Cost Price = Rs. 350
Gain = 20%
Selling Price = Cost Price * (100+G)100
                     = 350*120/100 = Rs.420
Hence he should sell it for Rs.420
Hope it helps.

Answer 2

He should sell the shirt for ((20/100)*350)+350)=420 rs....
u can check profit% =( p/CP)* 100
=70/350*100 = 20%