Aunit of electricity costs 13.2 pence. on average, tanya uses 90 units of electricity per week. she pays for her bill in 12 weeks. how much will her electricity bill be then?

Her electricity bill will be of 14256 pence.

Explanation

On average, Tanya uses 90 units of electricity per week.

So, the total units of electricity in 12 weeks will be: units

One unit of electricity costs 13.2 pence.

Thus, the total cost for 1080 units will be:   pence.

So, her electricity bill will be of 14256 pence.

< 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⭐