instructions.md

In this exercise you'll be writing code to help a freelancer communicate with a project manager by providing a few utilities to quickly calculate daily and monthly rates, optionally with a given discount.

We first establish a few rules between the freelancer and the project manager:

• The daily rate is 8 times the hourly rate.
• A month has 22 billable days.

The freelancer is offering a discount if the project manager chooses to let the freelancer bill per month, which can come in handy if there is a certain budget the project manager has to work with.

Discounts are modeled as fractional numbers representing percentage, for example 25.0 (25%).

1. Calculate the daily rate given an hourly rate

Implement the function dailyRateFrom(hourlyRate:) to calculate the daily rate given an hourly rate:

dailyRateFrom(hourlyRate: 60)
# => 480.0

The returned daily rate should be a Double.

2. Calculate the monthly rate, given an hourly rate and a discount

Implement the function monthlyRateFrom(hourlyRate:withDiscount:) to calculate the monthly rate, and apply a discount:

monthlyRateFrom(hourlyRate: 77, withDiscount: 10.5)
# => 12130

The returned monthly rate should be returned as a Double rounded to the nearest integer.

3. Calculate the number of workdays given a budget, hourly rate and discount

Implement the function workdaysIn(budget:hourlyRate:withDiscount:), that takes a budget, a hourly rate, and a discount, and calculates how many days of work that covers. The returned number of days should be returned as a Double rounded down to the nearest integer.

workdaysIn(budget: 20000, hourlyRate: 80, withDiscount: 11.0)
# => 35.0