This is realley simple. Dollars are in hundredths so a !5% sales tax is 5 cents a dollar. So five times ten is fifty. The answer is A. $0.50
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An easier way to get the answer for a percentage problem such as this (i.e. sales tax, 15% tip at restaurant, etc) is to take the total and multiply it by 1.(percentage).
So for your problem, $10 X 1.05 = $10.50
Or, if you're at a restaurant and your dinner total was $26.46 to find out the total payment (dinner cost, plus tip), you'd do $26.46 X 1.15 = $30.43
This is an easier way to find the TOTAL, not just the tax that would be added.