Which would you use to determine how much money you have left over to save each month?

I would use a bank. :) Please mark as brainlest.

Step-by-step explanation:

I would use a bank because it tracks what you spent your money on, it tells you how much you spent, and it tells you how much you have.

< coa = 150 ( given)

as ba and bc are tangents

so oc and oa is perpendicular to cb and ab respectively because in circle normal passes through centre

so in quadrilateral oabc

< coa + < oab + < ocb + < abc = 360

150 +90+90 + < abc = 360

330 + < abc = 360

< abc = 360 -330 = 30

so < abc = 30

⭐dhruv⭐