Question

A certain brand of soap powder is sold at RS. 8.50 per packet. It cost Rs. 85 a dozen. What is the gain or loss percent on 5 dozen packets?

Answer 1

A certain brand of soap powder is sold at RS. 8.50 per packet. 
he sold 12 packets at 85
s.p=85
c.p=12*8.50
          =102
gain or loss percent on 5 dozen packets
unitary method for c.p =(85/12 )×5
                                   35.4
unitary method for s.p =(102/12 )×5
                                   =42.5
c.p is more than s.p so it is losss 
loss=c.p-s.p
       =42.5-35.4
           =7.1 ruppes
loss% =(7.1/42.5)*100
          =710/42.5
          =7100/425
           =16.70%
loss%= =16.70%
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