GMAT Club Forumhttps://gmatclub.com:443/forum/ Photovoltaic power plants produce electricity from sunlight. As a resuhttps://gmatclub.com/forum/photovoltaic-power-plants-produce-electricity-from-sunlight-as-a-resu-77997.html Page 1 of 1

 Author: nitya34 [ 23 Apr 2009, 08:58 ] Post subject: Photovoltaic power plants produce electricity from sunlight. As a resu Photovoltaic power plants produce electricity from sunlight. As a result of astonishing recent technological advances, the cost of producing electric power at photovoltaic power plants, allowing for both construction and operating costs, is one-tenth of what it was 20 years ago, whereas the corresponding cost for traditional plants, which burn fossil fuels, has increased. Thus, photovoltaic power plants offer a less expensive approach to meeting demand for electricity than do traditional power plants.The conclusion of the argument is properly drawn if which one of the following is assumed?(A) The cost of producing electric power at traditional plants has increased over the past 20 years.(B) Twenty years ago, traditional power plants were producing 10 times more electric power than were photovoltaic plants.(C) None of the recent technological advances in producing electric power at photovoltaic plants can be applied to producing power at traditional plants.(D) Twenty years ago, the cost of producing electric power at photovoltaic plants was less than 20 times the cost of producing power at traditional plants.(E) The cost of producing electric power at photovoltaic plants is expected to decrease further, while the cost of producing power at traditional plants is not expected to decrease.

 Author: Talayva [ 17 Jul 2018, 12:18 ] Post subject: Re: Photovoltaic power plants produce electricity from sunlight. As a resu Negating Option D : Twenty years ago, the cost of producing electric power at photovoltaic plants was at least 10 times the cost of traditional power.Now consider, Cost of Photo Plant 20 years ago = P Cost of Traditional Plant 10 years ago = TNow, P >= 20 T Suppose P= 25TPresent Photo Plant Cost = P/10 =2.5TSince Traditional Plant cost also increased , but stimulus doesnt mention the increase , let us suppose that T at present is 100T2.5Tis not less than 100T . This doesnot break down the conclusion Assumption negation test failed .

 Author: nightblade354 [ 18 Jul 2018, 12:01 ] Post subject: Re: Photovoltaic power plants produce electricity from sunlight. As a resu This is a JUSTIFY question and not an assumption question. These are questions that are almost identical to assumption questions, but are testing a different aspect of your skills. Hence why the negation technique is not the way to go about this question. If you are not taking the LSAT, please stay away from this question as it will only confuse you. Here is an explanation from Powerscore: https://forum.powerscore.com/lsat/viewtopic.php?t=9113