Question

after allowing a discount of 20 percent on the marked price of a lamp, a trader loses 10 percent . by what percentage is the marked price above th cost price

Answer 1

let Cp = 100
sp = 90
mp = 90 *100/80 = 112.5
mp - cp = 112.5-100 = 12.5 % Answer

Answer 2

Answer:

Let cp be 100

Loss=10

Sp=100-10=90

Mp=Sp×100/100-d%

=90×100/100-80

=112.5

A/q-

Mp-Cp=112.5-100

=12.5