A person standing on a spring balance inside a stationary lift...

When lift is at rest

$N = mg$

$⇒ 60 \times 10 = 600N$

When lift moves with downward acceleration. In frame of lift pseudo force will be in upward direction.

${N}^{'} = M\left(g - a\right)$

$⇒ 60\left(10 - 1 . 8\right)$

${N}^{'} ⇒ 492N$