A furniture store is having a sale on sofas and you're going to buy one.

A furniture store is having a sale on sofas and you're going to buy one. The advertisers know that buyers get to the store and that 1 out of 11 buyers change to a more expensive sofa than the one in the sale advertisement. Let X be the cost of the sofa. What is the average cost of a sofa if the advertised sofa is $100 and the more expensive sofa is $225?

a)162.50

b)110.42

c)111.14

d)111.36