original price of first typewriter = x
2970/x = 110/100
x = 2970 x 100/110 = 2700
Price of first typewriter = Rs 2700
Original price of second typewriter = y
2970/y = 90/100
y = 2970 x 100/90
y = 3300
Original price of second typewriter = 3300
profit from first typewriter = 2970 - 2700 = 270
Loss from second typewriter = 3300 - 2970= 330
270 less than 330
so he lost 330 - 270 = Rs 60 in whole transaction