Shelly pays $6.99 for lunch, plus 9% sales tax. What was her final bill?

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Answer 1 · 2018-01-23T12:35:07

See a solution process below:

The formula for adding sales tax to the purchase price of an item is:

#t = p + (p * r)#

Where:

#t# is the total price: what are solving for in this problem.

#p# is the purchase price of the item: $6.99 for this problem.

#r# is the tax rate: 9% for this problem. "Percent" or "%" means "out of 100" or "per 100", Therefore 9% can be written as #9/100#.

Substituting and calculating #t# gives:

#t = $6.99 + ($6.99 * 9/100)#

#t = $6.99 + ($62.91)/100#

#t = $6.99 + $0.6291#

#t = $7.6191#

Or

#t = $7.62# rounded to the nearest cent.