## Example

The supply for bananas follows the equation: `Q_s = 3 + 2P`.

If bananas are sold for $3, the quantity supplied is `Q_s = 3 + 2 \times 3 = 9` bananas.

### Question

The supply equation for cookies is `Q_s = 65 + 90 \times P`.

If cookies were sold for $34, how many cookies will be produced?

Plug the price $34 into the demand function:

`Q_s = 65 + 90 \times P = 65 + 90 \times 34 = 3125`.