a) $$4\frac{1}{6}$$%
b) $$6\frac{1}{4}$$%
c) $$8\frac{1}{3}$$%
d) 20%
Answer: c
Explanation:
$$\eqalign{
& {\text{C}}{\text{.P}}{\text{. of 1 kg}} \cr
& = {\text{Rs}}.\left( {\frac{{420}}{{70}}} \right) \cr
& = {\text{Rs}}{\text{. }}6. \cr
& {\text{S}}{\text{.P}}{\text{. of 1 kg}} \cr
& = {\text{Rs}}{\text{. }}6.50. \cr
& {\text{Gain}}\% = \left( {\frac{{0.50}}{6} \times 100} \right)\% \cr
& \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = \frac{{25}}{3}\% \cr
& \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = 8\frac{1}{3}\% \cr} $$
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