Sale amount 399.79 sale tax 5%

Sale amount 399.79 sale tax 5%=> 399.79 dollars is the 100% value and the amount of the sales. Now, it is being charged with a 5% sales tax. What we need to do first is to solve for the value of 5% tax, then add it to the amount of the sales. Let's start solving this equation:=> 5% = 5% / 100% =.05=> 399.79 *.05 = 19.99Now, let's add = > 399.79 + 19. 99 = 419.78 dollars will be the new price of the sales.