Day 1=0.01

Day 2=0.02

Day 3=0.04

This is geometric progression with r=2

So

Sn= G1(r^n-1)/r-1

Where G1= 0.01$ and r =2

S30 = 0.01 (2^30 -1)/2-1

= 0.01 (2^30 -1)

= 10737418.23

That means my monthly salary is $ 10737418.23

I will take the job.... provided that it is not illegal job