The usual price of a marker sold at Shop N and P is $20. During a sale, a discount of 20% is given to every marker sold at Shop N. At Shop P, a discount of 30% is given to the 5th marker for every 5 markers sold. How much cheaper would it be if Jade buys 12 markers from Shop N instead of Shop P?

	Shop N	Shop P
Price of 1 marker	80%  $16	100% $20
Every 5th marker		70% $14

Price of 1 marker from Shop N in percentage
= 100% - 20%
= 80%

Price of 1 marker from Shop N at 20% discount
= 80% x 20
= ⁸⁰₁₀₀ x 20 
= $16

Cost of 12 markers from Shop N
= 12 x 16
= $192

Price of the 5th marker from Shop P in percentage
= 100% - 30%
= 70%

Cost of 5th marker at Shop P
= 70% x 20
= ⁷⁰₁₀₀ x 20 
= $14

Cost of 1 set of 5 markers at Shop P
= 20 x 4 + 14
= $94

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

Cost of 2 sets of 5 markers at Shop P
= 2 x 94
= $188

Cost of 2 markers at Shop P
= 2 x 14
= $28

Cost of 12 markers at Shop P
= 188 + 28
= $216

Amount cheaper if Jade buys 12 markers from Shop N instead of Shop P
= 216 - 192
= $24

Answer(s): $24