a) 5%
b) 10%
c) 15%
d) 20%
Answer: d
Explanation: b – a = 3 – 2 = 1
B = Rs. 1728, A = Rs.1440
$$\eqalign{
& R\% = \left( {\frac{B}{A} – 1 \times 100} \right)\% \cr
& \,\,\,\,\,\,\,\,\,\,\,\, = \left( {\frac{{1728}}{{1440}} – 1 \times 100} \right)\% \cr
& \,\,\,\,\,\,\,\,\,\,\,\, = \left( {\frac{{288}}{{1440}} \times 100} \right)\% \cr
& \,\,\,\,\,\,\,\,\,\,\,\, = 20\% \cr} $$
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