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 day- and month 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 to apply 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 followed by a % (percentage) between 0.0% (no discount) and 90.0% (maximum discount).

Tasks

1. Calculate the day rate given an hourly rate

Implement a function to calculate the day rate given an hourly rate:

dayRate(89)
// => 712

The day rate does not need to be rounded or changed to a "fixed" precision.

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

Implement a function to calculate the month rate, and apply a discount:

monthRate(89, '42%')
// => 9086

The discount is always passed as a string. The result must be rounded up to the nearest whole number.

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

Implement a function that takes a budget, a rate per hour and a discount, and calculates how many days of work that covers, to one decimal place.

daysInBudget(20000, 89, '20.02%')
// => "35.1"

The discount is always passed as a string. The result is the number of days to one decimal place, as a string.