Answer :

Given that, selling price of coolers = Rs.3990 each.On first cooler, gain = 5% and on second cooler, loss = 5%

For first cooler -


Gain = Selling price - cost price




cost price of first cooler = Rs.3800


For second cooler -


Loss = cost price - Selling price




cost price of second cooler = Rs.4200


total cost price = Rs.3800 + Rs.4200


= Rs.8000


And total selling price = Rs.3990 × 2


= Rs.7980


cost price>selling price loss


And loss = total cost price - total selling price


= Rs.8000 - Rs.7980


= Rs.20




= 0.25%


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