Foundation November 2018 Paper 2 Q18

EdexcelCurrent spec2 marksPercentages

18 Bill wants to increase 150 by 3%
He writes down

\(150 \times 1.3 = 195\)

Bill’s method is wrong.

(a) Explain why. (1)

Sally wants to decrease 150 by 3%

(b) Complete this statement to show how Sally can decrease 150 by 3%

\(150 \times \ldots\ldots\ldots\ldots = \ldots\ldots\ldots\ldots\)

(1)

Mark scheme (a)

Answer	Mark	Mark scheme
explanation	C1	explanation eg should be 1.03, this is 30% (not 3%) Acceptable examples Because 1.3 is 130% He is increasing it by 30% 1.3 means 1.30, not 1.03 He needs to put a 0 in front of the 3 1.3 is the wrong decimal He should multiply by 0.03 3% is 0.03, (not 1.3) His answer should be 154.5 He is meant to increase it by 4.5, not by 45 Not acceptable examples Because he is increasing by 130%, not 3% He needs to find 1% and then times it by 3