@luibel/dgm3780 v1.0.2

NPM Package Project - DGM370

Each function performs a common sales or business calculation. The functions are as follows:

Getting started

After installing the packing using:

npm i @luibel/dgm3780

You'll want to import the module in your javascript file by including this at the top of your file:

// exa:

const lib = require('@luibel/dgm3780')

let example = lib.discountPrice(100, 20) // equals 80

Included Functions

1) Calculating Margin:

Calculates the profit margin percentage based on the retail and wholesale price of a product

exa:

function margin(retail, wholesale) {
    let margin = Math.round((((retail - wholesale) / retail) * 100))
    return margin
}

margin(135, 72) // results in 46.67

2) Calculating Markup:

Calculates the percentage/difference between the actual cost and the selling price

exa:

function markup(retail, wholesale) {
    let markup = ((retail - wholesale) / wholesale)*100
    return markup
}

markup(135, 72) // results in 87.5

3) Calculating Profit Percentage:

Calculates the difference in the selling price vs the profit

unction profitPercentage(retail, wholesale) {
    let result = (retail / wholesale)
    Math.round((result + Number.EPSILON) * 100) / 100
    return result
}

profitPercentage(125, 60) // results in 108.33 

4) Interest Calculator:

Calculates the total amount accrued based on principle down payment, interest rate percentage and years.

function interest(principle, rate, years) {
    let r = rate/100
    let a = (principle * 1) + (principle * (r * years))
    Math.round((a + Number.EPSILON) * 100) / 100
    return a
}

interest(10000, 3.875, 5) // results in 12,134.14

Discounted Price Calculator:

Calculates the sale price of an item based on the retail price and discount percentage.

function discountPrice(price, discountPercent) {
    let d = 1 - (discountPercent / 100)
    total = price * d
    return total
}

discountedPrice(100, 25) // Results in 75