2022 June Business Economics and Business and Commercial Knowledge

Read the following data and answer Questions 55 - 56
X,Y and Z are three commodities where X and Y are complementary goods whereas X and Z are substitutes.
A shop keeper sells commodity X at Rs. 20 per piece. At this price he is able to sell 100 pieces of X per month.
After some time, he decreases the price of X to Rs. 10 per piece. Following the price decrease.
He is able to sell 150 pieces of X per month.
The demand for Y increases from 25 units to 50 units.
The demand for commodity Z decreases from 75 units to 50 units.