Question

Vishaka and Vaishali are shopping for antique jewellery. Vishaka’s 

demand function for antique jewellery is Q = 30 - 3P, and Vaishali’s demand 

function is Q = 48 - 4P. What will their combined market demand be if the 

price is Rs 5?

Answer 1

$Q = 30 - 3P$

$Q = 30 - 3(5)$

$Q = 30 - 15$

$Q = 15$

$Q = 48 - 4P$

$Q = 48 - 4(5)$

$Q = 48 - 20$

$Q = 28$

combined demand will be

$15+28=43$