Posted by gaby on .
if a gift is 42.40 including tax,what is the retail price for the gift if the sales tax is 6% ??

math 
Marth,
Set up a ratio. The cost of the gift including tax is 106% of the cost without tax.
42.40/106 = x/100
Solve for x.
(Note it does not matter whether you use 1.06 or 106 for the percentages in the ratio as long as you are consistent). 
math 
Ms. Sue,
1.06x = 42.4
x = 42.4 / 1.06
x = ? 
math 
drwls,
42.40 = X * 1.06
where X is the retail price
X = 42.40/1.06 = $40.00