Answer:
2.38%
Explanation:
In January 2017 the average house price in an area was $279,400
In January 2002 the average house price was $196,300
Therefore the annual increase in selling price can be calculated as follows
t = 15
= ($279,400/$196,300)^1/15 -1
= 1.42333^0.06666 -1
= 1.02378 -1
= 0.02378 ×100
= 2.38%
Hence the annual increase in selling price is 2.38%