The usual price of a marker sold at Shop K and L is $20. During a sale, a discount of 25% is given to every marker sold at Shop K. At Shop L, a discount of 60% is given to the 5th marker for every 5 markers sold. How much cheaper would it be if Cindy buys 12 markers from Shop K instead of Shop L?

	Shop K	Shop L
Price of 1 marker	75%  $15	100% $20
Every 5th marker		40% $8

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

Price of 1 marker from Shop K at 25% discount
= 75% x 20
= ⁷⁵₁₀₀ x 20 
= $15

Cost of 12 markers from Shop K
= 12 x 15
= $180

Price of the 5th marker from Shop L in percentage
= 100% - 60%
= 40%

Cost of 5th marker at Shop L
= 40% x 20
= ⁴⁰₁₀₀ x 20 
= $8

Cost of 1 set of 5 markers at Shop L
= 20 x 4 + 8
= $88

Number of sets of 5 for markers at Shop L
= 12 ÷ 5
= 2 r 2

Cost of 2 sets of 5 markers at Shop L
= 2 x 88
= $176

Cost of 2 markers at Shop L
= 2 x 8
= $16

Cost of 12 markers at Shop L
= 176 + 16
= $192

Amount cheaper if Cindy buys 12 markers from Shop K instead of Shop L
= 192 - 180
= $12

Answer(s): $12