You need to subtract the bonus points form the final score: 91-4=87
If you already know that you have . . .
1$ after week 1
2$ after week 2
4$ after week 3
8$ after week 4
. . . You can then tell that every week the money you save doubles (times 2)
So to continue . . . .
16$ after week 5
32$ after week 6
64$ after week 7
128$ after week 8
256$ after week 9
512$ after week 10
You will then know that after ten weeks u will have 512$ which is answer choice D.
Hope this helps! :)
It looks a little less than 1/2 or 4/8, so probably 3/8 of the gas is left.
<h2>It's <u>1849</u></h2>
I'll explain how I found it without actual multiplication,

So,

Hope this will help....