Question

find the c.p
if s.p is Rs 30 and gain 25

Answer 1

cp ×(1 + p/100) =30
cp(1+25/100)30
cp×5/4=30
co=6×4=24rs
answer
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Answer 2

C.P. = Rs 5. ( As if profit, Profit = S.P.-C.P)