SOLUTION: I don't get the question, and I don't know how to do it. Please help me on this problem: A store has a 30% discount on every item in stock. By how much is the 5% sales tax reduced

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Question 885960: I don't get the question, and I don't know how to do it. Please help me on this problem: A store has a 30% discount on every item in stock. By how much is the 5% sales tax reduced on an item that regularly sells for $10? (This is exactly how it looks like in my textbook.)

Found 2 solutions by rothauserc, josmiceli:
Answer by rothauserc(4718) (Show Source):
You can put this solution on YOUR website!
first calculate 5% of $10 = .05 * 10 = $0.50
now calculate 30% of $10 = 0.30 * 10 = $3, therefore
the cost of the item is reduced to 10 - 3 = $7
now calculate 5% of $7 = .05 * 7 = $0.35
we see that the 5% sales has been reduced by $0.50 - $0.35 = $0.15

Answer by josmiceli(19441) (Show Source):
You can put this solution on YOUR website!
A 5% sales tax on a $10 item is:
or $.50
After tax it casts $10.50
-----------------------
The $10 item with a 30% discount
before tax costs:

or $7
and

so
the item costs $7.35 after tax
---------------------
As for what they want:
So, the sales tax before the discount
was $.50
The sales tax after the discount
was $.35
----------------------

The sales tax got reduced by $.15
Hope I got it