A model for$$ consumers' response to advertising is given by the equation

Upper N left parenthesis a right parenthesis equals $2400$ plus $450$ ln aN$($a$)=2400+450$lna

where$$ N$($a$)$ is the number of units$$ sold, a is the amount spent on$$ advertising, in thousands of$$ dollars, and

a greater than or equals $1$a$1.$

Part $2$

How many units were sold after spending$$ $$1,000$ on$$ advertising?

Units sold after$$ $$1,000$ was spent on advertising equaled

enter your response here.