A fruitseller made a profit of 20 % by selling 3 dozen apples at the rate of Rs. 12 per apple. Find the price he paid for all the apples.[ Experts, please do not give a link related to this. Please just solve it ]

Let the CP of an apple = Rs xthen the CP of 36 apples = Rs 36x    as 1 dozen apples = 12 applesSP of an apple = Rs 12SP of 36 apples = Rs 12 × 36 = Rs 432Now, profit% = profitCP×100 %20 = profit36x×1005 profit = 36x5SP - CP = 36x5432 - 36x = 36x2160 - 180x = 36x216x = 2160x = 10So, CP of an apple = Rs 10CP of 3 dozen apples = Rs 10×36 = Rs 360

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