JavaScript errors due to miscalculations Incorrect calculations lead

Here is the formula I am using in my Javascript code:

total = parseFloat(unit * rate) + 
        parseFloat(rateamount) + 
        parseFloat(((unit * rate) + 
        (rateamount)) * (tax/100));

The values for the variables are as follows:

unit = 5, rate = 10, rateamount = 10, tax = 10.

Currently, the formula is returning a result of 561, which is incorrect.

If you have any suggestions or solutions, please feel free to share them. Thank you!

Answer №1

The issue lies in the concatenation of strings within this portion of your code:

parseFloat(((unit * rate) + (rateamount))

You neglected to parse rateamount, which is represented as a string '10'.

The corrected version should look like this:

var unit = '5',
  rate = '10',
  rateamount = '10',
  tax = '10';

var total = parseFloat(unit * rate) + parseFloat(rateamount) + parseFloat(((unit * rate) + parseFloat(rateamount)) * (tax / 100));
console.log(total);

However, it's advisable not to utilize parseFloat multiple times; instead, it's better to parse the values just once before proceeding with any calculations to prevent errors.

var unit = '5',
  rate = '10',
  rateamount = '10',
  tax = '10'

var parsedUnit = parseFloat(unit),
  parseRate = parseFloat(rate),
  parsedRateamount = parseFloat(rateamount),
  parsedTax = parseFloat(tax);

var total = parsedUnit * parseRate + parsedRateamount + ((parsedUnit * parseRate) + (parsedRateamount)) * (parsedTax / 100);
console.log(total);

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