The value of jewellery changes every year. The table shows the value, in pounds, of a ring for the years 2009 to 2012.
| Year | 2009 | 2010 | 2011 | 2012 |
|---|---|---|---|---|
| Value | £105 | £120 | £125 | £140 |
Calculate the chain base index number for 2010, 2011 and 2012. Give each value correct to 3 significant figures.
