CP of 4 note books = Rs 35CP of 1 note book = Rs 354 = Rs 8 75SP of 5 note books = Rs 58SP of 1 note book = Rs 585SP of 1 note book = Rs 11 60Gain = SP - CP = 11 60 - 8 75 = Rs 2 85Gain % = GainCP×100%=2 858 75×100%=285875×100%=32 57%Profit on selling 1 notebook = Rs 2 85So, number of notebooks sold for a profit of Rs 2 85 = 1Number of notebooks sold for a profit of Rs 171 = 12 85×171 = 60

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CP of 4 note books = Rs 35 CP of 1 note book = Rs (\frac{35}{4}) = Rs 8.75 SP of 5 note books = Rs 58 SP of 1 note book = Rs (\frac{58}{5}) SP of 1 note book = Rs 11.60 Gain = SP - CP = 11.60 - 8.75 = Rs 2.85 Gain % = [\frac{Gain}{CP} \times 100] % = [\frac{2.85}{8.75} \times 100] % = [\frac{285}{875} \times 100] % = 32.57 % Profit on selling 1 notebook = Rs 2.85 So, number of notebooks sold for a profit of Rs 2.85 = 1 Number of notebooks sold for a profit of Rs 171 = \frac{1}{2.85} \times 171 = 60

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