Transport NSW is trialling a new system for highway toll. You need to pay $1 up to the first 10 kms, and after that the the toll doubles for every 10kms or part of.

Thus, if you travel 32kms, its $1 for the first 10, another $2 for the second 10, another $3 for the third 10, and another $4 for the last km (even though you didn't use the full 10kms).

Define a function that when passed the distance travelled in kms, returns the applicable toll.

Mathematically, this can be done without using loops too.