Answer:
153.6
Step-by-step explanation:
Significant figures can be easily understood as the amount of digits in a number given. It gets a bit harder when you throw zeros in some places, but for now this question is pretty simple.
Four sig figs would look like this xxx.x, so you just round the number to fit that. With this, you should get 153.6 since that is rounded up.
Hope this helped! :^)