JNU SSS 2011 Question 15: National income accounting

Consider an economy in which only three goods $X$, $Y$ and $Z$ are produced. $X$ and $Y$ are consumption goods and the output of $Z$ in a year is used up in production of $X$ and $Y$ in that year. The following table gives the unit prices ($p_X$, $p_Y$ and $p_Z$ rupees respectively) and the number of units produced ($q_X$, $q_Y$ and $q_Z$ respectively) of each of the goods for three years I, II and III :

What is the rate of growth of real GDP (base year I) in year III?