The selling price of an item is $ 455 after 6 months of not selling, it is marked down by 20%. after another 6 months of not selling, it is further marked down by 30%. find the sale price after both markdowns.

< 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⭐