How much work is done to pull a spring from 10 cm to 13 cm, the stiffness coefficient is 200 N / m

How much work is done to pull a spring from 10 cm to 13 cm, the stiffness coefficient is 200 N / m

All the answers upstairs are bullshit
E0=.5k*(10-7)^2
E=.5k*(13-7)^2
W=E-E0
=.5k*[0.06^2-0.03^2]
=.5*200*0.03*0.09
=0.27J