Given C.P of first fan = Rs 1200
He sold the fan at a loss of 5%
⇒ Loss on first fan= 5% of 1200
= 5/100*1200
= Rs 60
S.P of fan = C.P - loss
= 1200 -60
= Rs 1140
C.P of 2nd fan = Rs 1200
He sold at a profit of 10%
profit of second fan= 10% of 1200
= 10/100*1200
= Rs 120
S.P of 2nd fan = profit + C.P
= 1200+120
= Rs 1320
Total cost price of two fans = 1200 + 1200 = Rs 2400
Total S.P of 2 fans = 1320+1140 = Rs 2460
Since S.P > C.P
He got profit on whole
profit = S.P - C.P
= 2460 - 2400
= Rs 60
Profit% = profit/C.P * 100
= 60/2400 * 100
= 2.5% profit on whole