21 a 5 × 90 = 450 minutes Best buy is 5 pack for 80 minutes each @ M1 3 M1 for method of multiplying up for total minutes and H £6.50 ÷ 450 = 1.44p per minute £4.00 then division to identify either cost per minute or time 5 × 80 = 400 minutes per £ £6.50 ÷400 = 1.625p per minute B2 5 × 80 = 400 minutes B1 for correct workings in first of the three cases £4.00 ÷ 400 = 1p per min cheapest B1 for the correct working in the second two cases Or 450 ÷ 6.50 = 69 minutes per £1 400 ÷ 6.50 = 62 minutes per £1 400 ÷ 4.00 = 100 minutes per £1 best value b 80 minutes is not long enough. B1 B1 for explanation of possible reasons not to choose the best buy 4 800 × 1.19 = M1 2 M1 for multiplications H 22 €952 800 × 1.22 = B1 B1 for subtraction ft €976 = They will get more. A1 A1 cao €976 – €952 €24 €24 3
21 a b 5 × 90 = 450 minutes £6.50 ÷ 450 = 1.44p per minute 5 × 80 = 400 minutes £6.50 ÷400 = 1.625p per minute 5 × 80 = 400 minutes £4.00 ÷ 400 = 1p per min cheapest Or 450 ÷ 6.50 = 69 minutes per £1 400 ÷ 6.50 = 62 minutes per £1 400 ÷ 4.00 = 100 minutes per £1 best value Best buy is 5 pack for 80 minutes each @ £4.00 80 minutes is not long enough. M1 B2 B1 3 M1 for method of multiplying up for total minutes and then division to identify either cost per minute or time per £ B1 for correct workings in first of the three cases B1 for the correct working in the second two cases B1 for explanation of possible reasons not to choose the best buy H 4 22 800 × 1.19 = €952 800 × 1.22 = €976 €976 – €952 = €24 They will get €24 more. M1 B1 A1 2 M1 for multiplications B1 for subtraction ft A1 cao H 3
Foundation_Skills_Ratio_MarkScheme_AQA.docx