Suppose that the demand and price for a wrist watch are related by the following equation:
p = d(q) = 28 - 2.25
where p is the price (in dollars) and q is the quantity demanded (in hundreds).
a. find the price when the demand is 0 watches. b. find the price when the demand is 400 watches.
c. find the quantity supplied at a price of $10.

a. $28

b. $19

c. 800 watches

Explanation:

The equation is

p = D(q) = 28 - 2.25

The equation of the demand would be

P = 28 - 2.25q

a. The price would be

= $28 - 2.25 × 0

= $28 - 0

= $28

b. The price would be

= $28 - 2.25 × 4

= $28 - 9

= $19

The quantity demanded is come in hundreds so we take only 4

c. The quantity woul dbe

$10 = $28 - 2.25q

$10 - $28 = -$2.25q

-$18 = -$2.25q

So q would be

= 800 watches

the correct answer is:

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