(a)
Percentage change in price:
"=\\frac{80-100}{100}\\times100=-20"%
Percentage change in quantity:
"=\\frac{Q_2-25}{25}\\times100=4Q_2-100"
PED= Percentage change in quantity divided by percentage change in price.
"-1.5=\\frac{4Q_2-100}{-20}"
"\\implies Q_2=32.5=33"
(b)
Cross price elasticity of demand is given by percentage change in quantity of X divided by percentage change in price of Y.
Percentage change in quantity of X:
="\\frac{Q_2-33}{33}\\times100=3.03Q_2-100"
Percentage change in price of Y:
"=\\frac{35-30}{35}\\times100=14.3"
"\\implies 1=\\frac{3.03Q_2-100}{14.3}"
"Q_2=37.72=38."
(c)
The total revenue of hotel madrilena will increase.
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