The Sales S (In Thousands of Units) of a Cleaning $S = 20 \left( 1 - e ^ { k x } \right)$

Multiple Choice

The sales S (in thousands of units) of a cleaning solution after x hundred dollars is spent on advertising are given by $S = 20 \left( 1 - e ^ { k x } \right)$ When $450 is spent on advertising, 2500 Units are sold. Complete the model by solving for k and use the model to estimate the Number of units that will be sold if advertising expenditures are raised to $650. Round Your answer to the nearest unit.

A) 3508 units
B) 6401 units
C) 2160 units
D) 5663 units
E) 8787 units