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1. A dealer allows his customer a discount of 25% and still gains 25%. If cost price of a radio is Rs. 1440, its marked price is:

Solution:
Let MP = X
CP = 1440
SP = 1440 + 25% of 1440 = Rs. 1800
SP = MP - 25% of MP
SP = X - 25% of 100
SP = X - 0.25X
1800 = 0.75X
X = 2400
MP = Rs. 2400

Short-Cut
Let the marked price = Rs. x
Hence,
75×x100=1440×125100
⇒ 1440×12575  = Rs. 2400

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