Let India's $GDP = Rs. x$
$Rs.\;50=1\;USD$
$Rs.\;x=\dfrac{1}{50}\times x\; USD$
New $GDP=GDP+0.07\times GDP$
$\quad =Rs\; 1.07x$
$Rs\; 60=1\; USD$
$Rs\; 1.07x=\dfrac{1}{60}\times 1.07x$
$\text{Change in GDP} = \dfrac{new-old}{old}\times 100$
$\quad =\dfrac{\left(\dfrac{1.07x}{60}\right)-\left(\dfrac{x}{50}\right)}{\dfrac{x}{50}}\times 100$
$\quad =\dfrac{\left(\dfrac{-13x}{6000}\right)}{\left(\dfrac{x}{50}\right)}\times 100$
$\quad = \left(\dfrac{-13}{120}\right)\times 100$
$\quad = -0.10833 \times 100$
$\quad = -10.833$
$\quad \approx -11 $
So, there is an $11\%$ decrease
Answer = option D