Kayla sells custom nail polish and she estimatesthe revenue,R, will depend on the price she charges per unit, x, according to the function: R(x)=10xx2()=102.The instantaneous rate of change atx= 1 is 8; the instantaneous rate of change atx= 5 is 0; the instantaneous rate of change atx= 10 is-10; and the instantaneous rate of change atx= 15 is-20.

Which instantaneous rate of change is best for Kayla?

-$10 revenue per dollar of price

$8 revenue per dollar of price

-$20 revenue per dollar of price

$0 revenue per dollar of price