How do you find the total cost of something with tax and the final total with a discount?
November 24, 2009 | Posted by Rajendrasinh Padhiar 
0carina asked:
For example, say I’m buying an item for $19.99 and the sales tax is 7%. How do you find the total cost of the item? And after finding the total amount, how do you find the grand total of the item with a 10% discount?
For example, say I’m buying an item for $19.99 and the sales tax is 7%. How do you find the total cost of the item? And after finding the total amount, how do you find the grand total of the item with a 10% discount?
Categories: United States | 
Tags: Grand Total, Sales Tax | 
2 Comments »
You just multiply the item price by 1 and the tax rate to find the total cost.
Example:
19.99 x .07 = the tax alone
19.99 x 1.07 = the total amount
Then, if you want to subtract a portion of the price, calculate the discount as a percentage: 10% = .10
For example:
21.40 x .10 = 2.14
Then you deduct 2.14 from 21.40, which is 19.26.
The tax is the last thing you add in so take the discount off first. So 10% or .10 of $19.99 is $1.999 or $2.00 so to find the now discounted price take $19.99-$2.00=$17.99. Now take the $17.99 and multiply by 7% or .07 which gives you a figure of $1.26 so add that to your original $17.99 and you come up with your grand total tax and all of $19.25. Hope this helps.
Jess