[Codewars] Transportation on vacation (8 kyu) / JavaScript

https://www.codewars.com/kata/568d0dd208ee69389d000016

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DESCRIPTION:

After a hard quarter in the office you decide to get some rest on a vacation. So you will book a flight for you and your girlfriend and try to leave all the mess behind you.

You will need a rental car in order for you to get around in your vacation. The manager of the car rental makes you some good offers.

Every day you rent the car costs $40. If you rent the car for 7 or more days, you get $50 off your total. Alternatively, if you rent the car for 3 or more days, you get $20 off your total.

Write a code that gives out the total amount for different days(d).

 

코드

function rentalCarCost(d) {
  let total = d * 40;
  return d >= 7 ? total - 50 : d >= 3 ? total - 20 : total; 
}