. Estimate the sales tax and final cost of a book that costs $12.95 with a sales tax

Question

of 6%.

Answer 1

13 * 0.06 = ?

In my head -- I'd multiply 13 by 3 and then double it.

Of course the tax will be less than a dollar, so adjust the decimal point accordingly.

Answer 2

do 0.06*12.95=0.777

Answer 3

Nope.
That's not an estimate. It's exact. Plus -- how do you figure 7/10 of a cent?

Answer 4

YEah, your right