Glen is looking into buying a piece of land. He estimates that the land measures 100 yd by 850 yd. The land is actually 140 yd by 940 yd. What is the percent error in the estimated area of the land?

Answer I got was 64.6%

Question

Glen is looking into buying a piece of land. He estimates that the land measures 100 yd by 850 yd. The land is actually 140 yd by 940 yd. What is the percent error in the estimated area of the land?

Answer I got was 64.6%

anonymous · Answer

100 x [(actual area) - (estimated area)] / (actual area) = percent error

anonymous · Answer

100 (940-850)/140 ?

anonymous · Answer

actual area is 940 x 140 and estimated area is 100 x 850.  Subtract those products, then multiply by 100, then divide by actual area.

anonymous · Answer

17.7%?

anonymous · Answer

Your math is off somewhere.  If you write it out, I can tell you where you went wrong.

anonymous · Answer

is 64.4 wrong?

anonymous · Answer

In a previous post, I gave the formula: 100 x [(actual area) - (estimated area)] / (actual area) = percent error.  I'm not sure how to explain this in any other way or in any greater detail.  Maybe you are havingtrouble with the brackets.  You have to do that subtraction befor multiplying by 100 or dividing at the end.  Just plug in the numbers.  Your very first step is to multiply out the widths and lengths to get the 2 areas.  Then you subtract and get ONE number.  You multiply by 100, and then you divide by the actual area which you already dtermined in the beginning.

anonymous · Answer

I can tell you that 64.4 is wrong, but I can't tell you why it is wrong because I can't see the steps you went through to get that number.