Â£1246.44

140 44 = 96
Use the on-screen calculator to find the cost before discount
96 x £3.95 = £379.20
Then take off the 10% discount (£37.92)
Use the on-screen calculator to find the cost after discount
£379.20 - £37.92 = £341.28
Follow the same procedure for Books B, C and D.
Book B
140 80 = 60
60 x £4.75 = £285
10% discount is £28.50
£285.00 - £28.50 = £256.50
Book C
140 133 = 7
7 x £7.95 = £55.65
(no discount as less than 10 copies ordered)
Book D
140 30 = 110
110 x £5.99 = £658.90
You could work out this stage mentally by multiplying 110 by £6 (£660) and subtracting
110 x 1p (£1.10).
10% discount is £65.89
£658.90 - £65.89 = £593.01
To find the total cost, add up the costs of the four titles.
£341.28 + £256.50 + £55.65 + £593.01 = £1246.44