21. 12 copies of a book were sold for 1800 thereby gaining cost price of 3 copies. The cost price of a copy of the books is (1) * 120 (2) * 150 (3) 1200 (4) 1500

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( 12 mathrm{sp}=₹ 1800 ) gain ( =3 times 0 ) gain ( =(5 mathrm{P}-mathrm{cP}) 12 ) ( begin{aligned} 3 mathrm{cp} &=1800-12 mathrm{cp} 15 mathrm{c} &=1800 end{aligned} ) [ begin{aligned} mathrm{cp}=& ₹ 120 end{aligned} ]

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