Cash over installments question .

There is a question in my book which is:

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Mr.Brown can pay for an article in either of the two ways. He can pay the list price with a down payment of 20% and the balance in 5 installments of $16 each or he can pay the cash price of $88.How much does he save by paying the cash price ?

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The book says the answer is $12.00 but according to me its $9.60. Here is how i did it

20% of 88 is $17.6
The installments will cost him :16x5=80
So He has to pay a total of 17.6+80=97.6
The difference would then be 97.6-88=9.6Ans
Is my answer correct and that's a typo in the book or am i doing something wrong here ??

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Originally Posted by MikeNoob

Here is how i did it
20% of 88 is $17.6

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That should be 20% of 100, leaving 80 (5 * 16 = 80)

If he chooses to pay cash, the 100 is reduced to 88.

12 is CORRECT.

Could you please clarify that a bit more. Why should it be 20% of 100 and not 20% of 88 (since the actual price of the item is $88)?

I am just confused why we should take 20% of 100 and not of 88

5*16 =80, this represents 80% of the total value since he already paid 20% of it, so 100% of the total is 100,
therefore we take 20% of 100 not 88.

Thanks for clearing that up guys!!!