When the price of good A is $24, the quantity of good B purchased is 800. When the price of good A is $36, the quantity of good B purchased is 1,200. The cross price elasticity of demand between goods A and B is

A.

0.16.

B.

0.40.

C.

1.00.

D.

none of the above.

These goods are

substitutes

complements

.