Don’s, a chain of supermarkets, has entered into an agreement in which Rose Computers will sell Don’s an unlimited number of its least expensive PC’s at one-fourth the regular wholesale price. In return, Don’s has agreed to purchase all of its scanners and other electronic information-processing equipment from Rose or from Omicron, Rose Computers’ parent company, for the next ten years. Don’s will offer a Rose PC free to any school that turns in Don’s register receipts totaling $100,000 within the next six months. The vice-president in charge of advertising for Don’s expects that the computer giveaway will obviate the need for a massive new advertising campaign for the next six months and that Don’s can make up the expenditures for the PC’s by writing them off its income taxes as charitable donations.
The plans formulated by Don’s assume each of the following EXCEPT:
(A) The prices that Rose or Omicron charges Don’s for information-processing equipment over the next ten years will be lower than those charged by other companies.
(B) The tax laws will not be changed to exclude or lessen the value of charitable donations as tax write-offs.
(C) Schools will be sufficiently attracted by Don’s computer giveaway offer that teachers will urge students to shop at Don’s.
(D) Rose will be able to supply Don’s with a sufficient number of PC’s to meet the demand generated by schools that collect Don’s receipts totaling $100,000.
(E) The effect of the computer giveaway offer on Don’s business will be comparable to that of a major advertising campaign.

"A"

A is the answer. Don's is agreeing to buy scanners from Rose/Omicron as reciprocation; it is probable, in fact, that other companies WILL offer a better deal at some point (otherwise Don's promise to buy something they'd buy anyway is worthless!).


B must be true because their plan hinges on charitable donations; if they no longer can do so, their computers become way more expensive. C is necessary for their plan because they plan to replace an advertisement campaign, so they must be attracting customers somehow for the plan to make sense. D has to be true because Don's needs enough machines to give away or they will have to discontinue the program. E is more or less stated in Don's conclusion; they think this scheme will obviate advertising, so it must provide much of the same benefits.
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In the Assumption Except questions is it better to rule out the answers to come to the right answer.

Like in this question.

Thanks

Exactly. The premise doesn't talks about information processing equipment and hence this option is easy to spot on.
Answer A
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Prepositional Phrases Clarified|Elimination of BEING| Absolute Phrases Clarified
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It took me 2 min 30 sec but choices were so easy to eliminate that i chose A and is the right answer.