How to add tax to subtotal?

Question

What is the subtotal to 237.97 after you add 7.00% tax?

Answer 1

Let me see, is this second, third, or fourth grade math?

7% = 7 cents on the dollar.

There are 237 total dollars, so

7+7+7+7+7+7+7+7+7+7=70

7+7+7+7+7+7+7+7+7+7=70

7+7+7+7+7+7+7+7+7+7=70

7+7+7+7+7+7+7+7+7+7=70

7+7+7+7+7+7+7+7+7+7=70

7+7+7+7+7+7+7+7+7+7=70

7+7+7+7+7+7+7+7+7+7=70

7+7+7+7+7+7+7+7+7+7=70

7+7+7+7+7+7+7+7+7+7=70

7+7+7+7+7+7+7+7+7+7=70

7+7+7+7+7+7+7+7+7+7=70

7+7+7+7+7+7+7+7+7+7=70

7+7+7+7+7+7+7+7+7+7=70

7+7+7+7+7+7+7+7+7+7=70

7+7+7+7+7+7+7+7+7+7=70

7+7+7+7+7+7+7+7+7+7=70

7+7+7+7+7+7+7+7+7+7=70

7+7+7+7+7+7+7+7+7+7=70

7+7+7+7+7+7+7+7+7+7=70

7+7+7+7+7+7+7+7+7+7=70

7+7+7+7+7+7+7+7+7+7=70

7+7+7+7+7+7+7+7+7+7=70

7+7+7+7+7+7+7+7+7+7=70

7+7+7+7+7+7+7=49

70+70+70+70+70+70+70+70+70+70=700

70+70+70+70+70+70+70+70+70+70=700

70+70+70+49=259

700+700+259=1659 cents

1659 cents = 16.59 dollars

.97 more dollars at 7 cents on the dollar is 6.79 cents.

6.79 cents + 1659 cents = 1666.79 cents.  Move the decimal 2 places to the left.  That leaves a total of 16.6679 dollars.

Add 237.97 dollars to 16.6679 dollars = 254.6379 dollars.