UPSC CAPF Assistant Commandant Model Paper 2

S.P of 12 tissues = 1 rupee
Hence S.P of 1 tissue = 1/12 rupee
S.P = C.P + profit
C.P = 1/12 – 25% of C.P
C.P + 25 × C.P/100 = 1/12
125/100 × C.P = 1/12
Hence, C.P = 100/(12 × 130) = 5/75
Hence, C.P of one tissue = 1/15 rupee
Then for C.P of 1 rupee, number of tissues = 15