SOLUTION: Sarah saves $400 the first month and every month later $45 more. John saves $4.35 the first month and every month later he doubles the amount. Who will have more after a year and a

Question 1157067: Sarah saves $400 the first month and every month later $45 more. John saves $4.35 the first month and every month later he doubles the amount. Who will have more after a year and a half?
Found 2 solutions by ikleyn, greenestamps:
Answer by ikleyn(52786) (Show Source): You can put this solution on YOUR website!
.

Excuse me, I read the first statement

Sarah saves $400 the first month and every month later $45 more.

and I have a question: $45 more THAN WHAT ?

Similar question is about John. The post says

every month later he doubles the amount.

Which amount does he double: the amount at the account or the amount he deposits every month ?

------------

Asking my questions, I am trying to let you know (in the most possible soft and polite form)
that it is NOT the way to formulate Math problems as you do it in this post.

Surely, the solutions obtained on such UNCERTAIN basis, have no any real value.

Have a nice day !

Answer by greenestamps(13200) (Show Source): You can put this solution on YOUR website!

Sara: 400 + 445 + 490 + ... + 1120 + 1165 = 18((400+1165)/2) = 14085

John: 4.35+8.70+17.40+...+...

The amount John saves in the 17th month is

Doubling the amount each month makes the total grow so fast that John could save a nickel ($0.05) the first month and still end up with more than Sara at the end of 18 months.

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