The supply situation for rice in country X over a period as shown in the table below. Use the information in the table to answer the questions that follow.
 

Period	Price ($)	Quantity supplied (bags)
December 2004	30	100
January 2007	40	150
April 2009	50	160

(a) Calculate the co-efficient of price elasticity of supply for rice between December 2004 and January 2007.
(b) Is the supply of rice elastic? Give a reason for your answer. 
(c) State any three reasons which may cause an increase in the supply of rice,