Question

A Starbucks coffee costs $4.50. What is the total price if the sales tax rate is 7%?

Answer 1

Multiply 4.50 by 0.07

4.50*0.07 = 0.315

Then the sales tax is about $0.32.

You can also do it mentally. Moving the decimal point in 4.50 once to the left gives you 10% of the original amount, 0.45. Move it again to get 1% of the price, 0.045. Then multiply this by 7 to get 7%.