The usual price of a marker sold at Shop D and E is $12. During a sale, a discount of 25% is given to every marker sold at Shop D. At Shop E, a discount of 50% is given to the 4th marker for every 4 markers sold. How much cheaper would it be if Nora buys 14 markers from Shop D instead of Shop E?

	Shop D	Shop E
Price of 1 marker	75%  $9	100% $12
Every 4th marker		50% $6

Price of 1 marker from Shop D in percentage
= 100% - 25%
= 75%

Price of 1 marker from Shop D at 25% discount
= 75% x 12
= ⁷⁵₁₀₀ x 12 
= $9

Cost of 14 markers from Shop D
= 14 x 9
= $126

Price of the 4th marker from Shop E in percentage
= 100% - 50%
= 50%

Cost of 4th marker at Shop E
= 50% x 12
= ⁵⁰₁₀₀ x 12 
= $6

Cost of 1 set of 4 markers at Shop E
= 12 x 3 + 6
= $42

Number of sets of 4 for markers at Shop E
= 14 ÷ 4
= 3 r 2

Cost of 3 sets of 4 markers at Shop E
= 3 x 42
= $126

Cost of 2 markers at Shop E
= 2 x 6
= $12

Cost of 14 markers at Shop E
= 126 + 12
= $138

Amount cheaper if Nora buys 14 markers from Shop D instead of Shop E
= 138 - 126
= $12

Answer(s): $12