Question

what is the answer of the 4 no question

Answer 1

Total S.P.= 3990+3990= Rs.7980
C,P. of 1st cooker= 3990 × 100/(100+5) = Rs. 3800
C,P. of 2nd cooker= 3990× 100/(100-5) = Rs. 4200
Total C.P.= 4200+3800= Rs. 8000
Loss= C.P.- S.P.
     = 8000 - 7980= Rs. 20
Loss%= 20×100/8000 = 0.25%

Answer 2

over all loss = 0.25%