Correct Answer: 30. (3)

Solution: 30. (3) Let the C.P. of items A and $B$ be $x$ and $y$ respectively.

Marked Price $: 1.40 x = 1.25 y$

S.P. : $ 1.40 x \times \frac{75}{100} = 1.25 y \times \frac{90}{100} $

$=1.050 x =1.125 y$

According to the question,

$1.050 x=1.125 y$

$\Rightarrow \frac{x}{y}=\frac{1125}{1050}>1$

$\Rightarrow x>y$

$\therefore$ I $>$ II

Aliter : Using overall $\%$ gain

$=\left(x+y+\frac{x y}{100}\right) \%$,

Overall $\%$ gain on $\mathrm{A}$

$=\left[40-25-\frac{40 \times 25}{100}\right] \%=5 \%$

Overall $\%$ gain on $\mathrm{B}$

$=\left[25-10-\frac{25 \times 10}{100}\right] \%=12.5 \%$

$\Rightarrow 1.05 x=1.125 y$

$\Rightarrow \frac{x}{y}=\frac{1.125}{1.050}>1$

$\therefore \quad$ I $>$ II