Dale had $80,000 on deposit in a six – month CD paying 2.72% simple interest. At the end of three months, Dale cashed out the CD. The penalty for early withdrawal of money
from this CD is one - month's interest. What was the amount of the penalty Dale had to
pay?

< 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

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