We have to evaluate the unit rate for 1 Apple for $0.19.
The formula for unit rate is shown below.
![\text{Unit rate }= \frac{\text{Cost of the prodcut}}{\text{Number of units}}](https://img.qammunity.org/2019/formulas/mathematics/middle-school/r5msl0rr0vhbluvyr57vpsqzv0pxthtjqt.png)
Now, we have been given the cost of the apple is $0.19 and the number of unit is 1. Hence, using the above mentioned formula, the unit rate is given by
![\text{Unit rate }= (0.19)/(1)\\ \\ \text{Unit rate }= 0.19](https://img.qammunity.org/2019/formulas/mathematics/middle-school/geg3a6mobjya2o61nz766m27dcwe89ib4u.png)
Therefore, the unit rate is 0.19 dollars per apple.