Question

Mr A sells a bicycle to Mr B at a profit of 20% and Mr B sells it to Mr C at a profit of 25%. If Mr C paid Rupees 1500 for it, what did Mr A pay for it?

Answer 1

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The CP is 125 for C, when CP for B is 100.
So, CP is 1500 for C, when CP for B = 100*1500/125  = Rs 1200 

Similarly 
The CP is 120 for B, when CP for A is 100.
So, CP is 1200 for B, when CP for A = 100*1200/12  = Rs 1000 

Therefore CP for A = Rs 1000