A person stands on platform spring scales in an elevator car at rest.

The scale indicates a reading of $1\mathrm{.}00$ x $103$ N$.$ When the car is

accelerating upward, the reading is $1\mathrm{.}15$ x $103$ N$.$ Find the magnitude

of the acceleration of the elevator car.

$($a$)0\mathrm{.}150$ m$/$s$2($b$)1\mathrm{.}47$ m$/$s$2($c$)$ neither of these