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# When you purchase the books, if the price of book is equal

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When you purchase the books, if the price of book is equal [#permalink]  12 Dec 2005, 10:48
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When you purchase the books, if the price of book is equal to or less than 15\$, the shipping fee is 20% of the price of book. When you purchase both two books x and y together, what is the total shipping fee?

1) The total combined price of two books x , y is \$18.95
2) The each price of two books x, y is at least \$4
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Re: DS - Shipping fee [#permalink]  12 Dec 2005, 11:27
gamjatang wrote:
When you purchase the books, if the price of book is equal to or less than 15\$, the shipping fee is 20% of the price of book. When you purchase both two books x and y together, what is the total shipping fee?

1) The total combined price of two books x , y is \$18.95
2) The each price of two books x, y is at least \$4

I think E is the answer. we don't konw what happens when price is over \$15.
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I think its C

statement 1 says book x + book y =18.85. We dont know the individual price of book x or book y. So insuff

statement 2 says that the minimum price of x and y is \$ 4. We still dont the exact price. So insuff

Taking both statements together:

Lets assume that price of book x = \$4. So price of book y=\$14.85. The freight charges @20%= \$3.77.

Now lets see the freight charges for some other possible values of x

If x=\$4.50, y=\$14.85, freight=\$3.77
If x=\$5.00, y=\$14.35, freight=\$3.77
If x=\$6.00, y=\$12.85, freight=\$3.77

Therefore the freight charges will be \$3.77 regardless of the price of x and y.

Hence C
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Should be C

1. Total cost is 18.95. X may be 1 and Y may be 17.95. No mention of shipping above 15 dollars
2. Price of each is not mentioned.

1 and 2 Together:

Cost of one is atleast \$4. So this must be true: (18.95 - 4) >= X or Y >= 4

So both of them are under \$15. Hence shipping cost is (X/5 + Y/5) i.e (X+Y)/5 = 18.95/5 = \$3.79
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