a) Rs. 1.92
b) Rs. 2
c) Rs. 2.50
d) None of these
Answer: a
Explanation: Total quantity purchased = 4 kg
Total Money paid
$$\eqalign{
& = {\text{Rs}}{\text{. }}\left( {1 + \frac{1}{2} + \frac{1}{3} + \frac{1}{4}} \right) \cr
& = {\text{Rs}}{\text{. }}\frac{{25}}{{12}} \cr} $$
Required average
$$\eqalign{
& = \left( {4 \times \frac{{12}}{{25}}} \right){\text{ kg/rupee}} = \left( {\frac{{48}}{{25}}} \right){\text{ kg/rupee}} \cr
& = 1.92{\text{ kg/rupee}} \cr} $$
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