a) 5 : 4
b) 3 : 2
c) 4 : 5
d) 3 : 4
Answer: b
Explanation: Candle – – – – – – – – Bulb
CP . . . . A – – – – – – – – B
SP . . . . C – – – – – – – – D
$$\eqalign{
& and.\,C = 2A \cr
& {\text{Profit}} = 10\left( {B – A} \right) = 3D \cr
& {\text{Loss}} = 10\left( {C – D} \right) = 4B \cr
& {\text{Profit}}\% = \frac{{ {3D \times 100} }}{{10A}} \cr
& {\text{Loss}}\% = \frac{{ {4B \times 100} }}{{10C}} \cr
& \frac{{ {3D \times 100} }}{{10A}} = \frac{{ {4B \times 100} }}{{10C}} \cr
& \frac{B}{D} = \frac{3}{2} = 3:2 \cr} $$
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