Percentage Increase in Cost of EggsDate: 8/4/96 at 21:2:21 From: Anonymous Subject: Percentage Increase in Egg Cost By what percent did the price of eggs increase from 1940 to 1950 if in 1940 the eggs cost 17 cents and in 1950 the eggs cost 39 cents?? I have no clue as to what steps you would take to solve this problem. Could you help me? Thanks so much :) Lindsay Date: 8/4/96 at 21:51:29 From: Doctor Paul Subject: Re: Percentage Increase in Egg Cost Well let's use common sense to estimate. You should know that if the price doubles that's a 100 percent increase. So if it went from 17 to 34 it would be 100 percent. So, by common sense, we can guess the answer will be about 110 percent. Let's continue: Here's the formula for finding percent increase: starting price * x = finishing price solve for x: subtract 1 from x, multiply that number by 100 and that's your percent increase.. let's do it! 17*x = 39 x = 39/17 x = 2.29412 x-1 = 1.29412 multiply by 100: 129.412 percent So our original estimate was off by a little, but was still fairly close. You should learn the value of estimating! It turns out to be very useful. I hope this answers your question. Feel free to send Dr. Math any more of your math questions. Doctor Paul, The Math Forum Check out our web site! http://mathforum.org/dr.math/ |
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