Question

please help in this question

Answer 1

let the C.P be Rs. x .Then, S.P will be 5x/4=1.25x

x+5=1.25x
5=1.25x-x
5=0.25x
x=5/0.25
x=20


Hence, C.P of the note is Rs. 20 and S.P is 20×1.25=Rs. 25.