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Tension in a string along with a Pseudo force

1. The problem statement, all variables and given/known data

A block of mass 50g is suspended from the ceiling of an elevator.Find the tension in the string if the elevator goes up with an acceleration of $$1.2m/s^2$$

2. Relevant equations

$$F_{net}=ma_{net}$$

3. The attempt at a solution
I have reached here:...but with this i dont get the books answer...The book takes net acceleration to be 0
If F be the pseudo force...then,
$$T-F_g-F=ma$$
$$a=1.2$$

So solving this i get an answer that differs from the one given in a problem book...that is 55N(the book's ans)

Ive realized that we get 55N if we take $$a_{net}=0$$.Now how is this possible?

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