arithmetic - hanuman sells a pen at a profit of 25 if he had bought it 20 less and sold it for rs 1050 less he would have gained 30 find the cost price of the pen - skillgun

Let the C.P be Rs x
1st S.P=125% of x =125x/100=5x/4; 2nd S.P=80% of x=80x/100=4x/5
2nd S.P=130% of 4x/5= (130/100*4x/5) =26x/25
=> 5x/4-26x/25=10.50
=> x= (10.50*100)/21=50
Hence C.P= Rs.50